Inside secret 19th-century tunnel under Naples that used to be escape route for the king

Mysterious tunnels built by King Ferdinand II of Bourbon snake underground in central Naples. These intriguing passageways were designed as an escape route for the king in 1853 before serving as a military hospital and bomb shelter in WWII and finally as a warehouse for impounded vehicles in the 1940s, 1950s and 1960s. The dusty aqueducts were recently rediscovered and now visitors can take a spell-binding tour of the tunnels encountering abandoned vintage motorbikes and cars along the way.

Is this China’s most luxurious hotel?

The Wanda Reign on the Bund hotel in Shanghai, China, took more than three years to build. The 20-storey building combines art deco style and early 20th century Chinese design. Pictured clockwise from top left: One of the four restaurants, a private karaoke room, a spa suite and the lobby. Inset: The hotel's exterior.

A video shows more than 100 passengers evacuating the plane in El Dorado airport, Bogota, down emergency chutes. The smoke was later identified as having come from one of the wheels.

If you’d rather leave your phrasebook at home, then head to Sweden, Argentina or India as they are among the countries where it is surprisingly easy to strike up a conversation in English.

Abandoned Soviet JET TRAIN that was once capable of travelling at 160mph

These fascinating pictures show a Soviet ‘turbojet railcar’, which was built in the 1970s and proved capable of reaching an astonishing 160mph, thanks to the huge jet engines on its roof. What made this concept impractical was the extremely high fuel consumption. And so this power car was pushed into a siding and left to rot.

A new infographic details the world's most beautiful subway stations. One station in Dubai has an underwater theme. Another in St Petersburg has chandeliers, swords and gilt columns.

Off-limits to tourists: From Bolivia's 'death road' to the ancient villages of Yemen, a

While much of the world is the modern traveller's oyster, there are regions you can't roam freely. Whether that be the mysterious lands of North Korea or Syria, currently in the throes of war. But in many of these places, extraordinary beauty lurks behind the tightly-drawn curtains, along with the promise that some day they'll be free to explore again. With a few exceptions, all the magnificent destinations showcased here fall under the FOC's red zone - areas where 'all travel' is expressly advised against. Said notable exceptions include Norway's Domesday Vault (inset), a heavily guarded cavern built under the Arctic snow which contains seeds from almost every nation on earth to be retrieved in the case of an global catastrophe. Good luck getting a peek in there. Pictured clockwise from top left: Congo's beautiful region of Likouala, Bolivia's 'Death Road', the Karakoram highway that links China with Pakistan and Yemen.

People from the UK have advised American tourists on what they should refrain from doing in order to avoid causing annoyance - and the suggestions are delightfully British.

The Mail on Sunday's Caroline Quentin first stayed at the Majestic Hotel in Kuala Lumpur, and then moved on to the idyllic 300-acre private island of Pangkor Laut in Malaysia

A replica suicide vest, skull-adorned throwing knives and a gas mask decorated with

From an ornate cane concealing a sword to a five-bladed flogger, the Transportation Security Administration has shared photos of the shocking items that travellers across the US have tried to take on planes. Pictured left are skull-adorned throwing knives seized from a carry-on bag at Chicago O'Hare Airport, right is a replica suicide vest discovered at Virginia's Richmond Airport and inset is a gas mask confiscated at Miami International Airport because it features replica bullets.

Neil English reluctantly hurtled down Austria's skeleton bobsleigh tunnel, coached by former Olympic champion Amy Williams at the Austrian Tirol resort of Igls.

The Mail of Sunday's Hilary Macaskill visited Charleville, nestled in French Ardennes close to the Belgian border - the hometown of the 19th Century poet who still has an active postbox.

The color of money! From ancient kings to glimmering bird holograms, the most beautiful

There's a certain small pleasure to be had in examining the first bank note you are handed in a foreign country. Some of them are so beautifully obscure, perhaps you've bought them home with you and kept them as little paper souvenirs, to accumulate dust as they lie scattered in random dusty drawers. Here, MailOnline Travel has hunted out some of the most colourful and exotic notes that are - or were once - in distribution around the world.

The Mail on Sunday's Caroline Hendrie sampled Crystal's new river cruise aboard the Mozart, a luxury ship which sailed across Austria, Germany, Slovakia and Hungary.

Package holidays to the Canary Islands in December are up to 40 per cent cheaper than booking flights and hotels independently - a result of major tour operators being less affected by Brexit.

Stunning ‘street art’ illuminates the Amazon rainforest with the faces of a tribe

Philippe Echaroux, who describes himself as an activist artist, has illuminated the Amazon with light projections of the faces of the Surui people. By illustrating the unflinching faces of the people whose lives are directly affected, the artist hoped to remind the international community of the ongoing environmental threat of deforestation and illegal logging in the region.

The revelation came after researchers from the University Hospital Munster and Robert Koch Institute, both in Germany, asked 39 tourists to swab 400 bathroom door handles at 136 airports in 59 countries.

The late Terry Wogan once said of his Irish hometown: ‘Limerick never left me; whatever it is, my identity is Limerick.’ - it's a city shrouded in history and fronted by the 800-year-old King John's Castle.

Father slams 'shambolic' Corfu family hotel for Fawlty Towers-style horrors

Nurse Tim Sheppard booked a week's trip to the Aquis Sandy Beach Resort in Corfu for the half term holiday with his partner Hayley Palk (inset, with Tim), and his two children Eloise, seven, and Amber, five. He described the resort as the hotel from hell - with most of the nine bars and restaurants closed. The family claim that their trip featured mouldy sun beds (bottom right); green slime in the swimming pool; broken drains; a litter strewn beach (top right and bottom left); rubbish stacked in corridors; a cracked and splintered entertainment stage; and dirty water at the buffet. Mr Sheppard, from Exeter, has revealed horror pictures of his £2,200 trip - booked through Thomas Cook.

The Cringletie House Hotel is a 19th Century home is now a 17-room hotel owned by an elderly Dutch couple, where fuss-free luxury and perfectly cooked haggis comes at a bargain.

The Daily Mail's Jenny Coad toured Colombia's capital city, Bogota, then voyaged inland to Armenia and the Cauca Valley before wrapping things up at the Koralia beach retreat near Tayrona.

Meet the man who travels the world on delivery flights of new planes drinking champagne

Aviation expert Alex Macheras,19,pictured, travels the world on inaugural flights. Enjoying cockpit views, empty cabins and champagne-filled VIP parties while testing these new jets, the Londoner reveals the perks of the job to MailOnline Travel. This year he has flown on short haul deliveries to Helsinki, the Swiss Alps and Frankfurt on Europe's first A320neo but more often than not can be found on long haul flights to Thailand and Uganda among other destinations, trialling the Airbus A350.

Davis Frost, CEO of the Scotch Whisky Association, was born in Derby but has lived and worked in Edinburgh for the past three years, and is now moving down to London for his new role.

Like rival Lufthansa, Air France-KLM has been hit by the rapid growth of carriers such as Emirates and Turkish Airlines, which have used new planes and lower prices to lure passengers.

Arizona's Phoenix Sky Harbor International beat 29 of the country's other busiest airports, with New York's LaGuardia ranking as worst, followed by John F. Kennedy.

National Geographic photographer Cory Richards charts his meteoric rise

Cory Richards, a 35-year-old Montana-based National Geographic photographer, speaks to MailOnline about his brave expeditions to Mount Everest (main images) and beyond - of which he said: 'When an avalanche swallowed me on Pakistan's Gashermbrum II mountain, I was sure I wasn't coming out alive.'

This month will see two meteor showers and the chance to see planets, a supermoon and a nebula – all with the naked eye. Space scientist Dr Maggie Aderin-Pocock explains when to look up.

In the remote community of Nunavut in Northern Canada, hunters are concerned about a mysterious pinging sound that appears to derive from the sea floor.

From the golden tortoise beetle found in the Americas to the Australian lyre bird that can imitate virtually any sound, an infographic reveals where tourists can discover these rare species.

According to pilots and aviation experts discussing the matter on a US-based thread, a pilot will only inform passengers of an impending crash if they have enough time.

Now THAT’S mist-ifying: Incredible footage shows planes landing at London’s Gatwick airport despite dense fog

According to the filmmaker visibility was so poor at the London airport that some planes were actually forced to circle before landing or divert to another airport. The video has been viewed over 25,000 times online, with many impressed by the filming and the skill of the pilots. According to Plane Clever, by Christopher Bartlett, modern airliners can ‘land virtually automatically in fog’, but the air traffic controllers will space the aircraft out more as they land and depart.

The town of Bodie dates back to 1859 when a group of prospectors - including W.S. Bodey - built up a settlement after they struck gold in California's Sierra Nevada Mountains.

The US Geological Survey has released satellite images showing the scale of California's increasingly arid conditions and the impact on local water resources.

MailOnline Travel drops in on the 11th Havana Club Cocktail Grand Prix and is wowed by the show the entrants put on. We're also taken with the crumbling but electric city itself.

Hunt owns farmhouses and manor houses in deepest Suffolk among lawns and forest that are available as lets. MailOnline booked into a forester's cottage, with no electricity. And loved it.

A daring couple took marriage proposals to new heights when they popped the big question inside the enclosure of a 500kg crocodile, on the Central Coast of New South Wales.

A tour guide almost lost his arm to a crocodile after it leaped out of a lake in the Northern Territory and snapped at him as he leaned over the side of a boat.

The Siena International Photo Awards is setting EXTREMELY high standards

The Siena International Photo Awards, held at the Teatro dei Rozzi on Sunday, revealed winners across 11 categories in total. Pictured main is Mount Etna erupting in Italy, winner of the Nature category, bottom left a killer whale drawn to a fishing boat in Tromsø, Norway, winner of the Wildlife category and bottom right a skier leaps from a 32-foot cliff, also shot in Tromso, Norway, which won the Sport category.

There's less than a month until the official start of summer, and while parts of Australia are sweltering through record heat, others are bracing for a temporary trip back to winter this weekend.

Barefoot, the 31-year-old catwalk queen struck a number of sexy poses for the camera, all of which highlighted her supremely toned physique. She was on the beach in Miami on Thursday.

The no-filter Instagram images that prove you don’t need Photoshop for a stunning shot

Photographers have submitted their best examples of photos taken either just before sunrise or just after sunset - known collectively as Golden Hour - in locations from Dubai (main), to Australia (top left) and India (top right).

The Sydney Opera House is one of the most famous buildings on the planet with revered architecture. But an image of dishes in a rack Photoshopped onto the spot occupied by the building has gone viral.

The Met Office said the conditions mean there is a 30 per cent likelihood the mercury will plunge at the beginning of this winter - the highest risk of a cold start since the bitterly cold season of 2010/11.

Why the hotel of the future could be an eco-pod robot 'jellyfish' with 'tentacles' that

Conceived by Janine Hung, a graduate architect based in the Philippines, the floating lodges (pictured) boast kitchen and bathroom-equipped living quarters and gardens in their underbelly that can raise fish and grow vegetables. Beneath the surface, the solar-powered structure has 'tentacles' (inset) which capture and collect rubbish, and filter polluted water - either storing it for human use or returning it to its source clean.

If you thought that cruise and spa holidays were out of reach, you’re in for a pleasant surprise. A new infographic on holiday costs has revealed how city breaks are actually more expensive.

An interactive map has revealed that Mandarin is the most expensive language to learn costing £66,035 to become fluent while French is the easiest to grasp. It can be mastered for £14,000.

Amy Evans, a 21-year-old McDonald's worker from Aberdeen, Scotland, believes she got ill as a result of her room in Ayia Napa, Cyprus, which she says was covered in 'mould, blood and vomit'.

The map of the world is one of the most familiar illustrations there is. But when resized according to popularity with tourists Russia, Africa and South America look peculiarly shrivelled.

The incredible submerged plaza you have to walk into the sea to reach off West Palm Beach

A futuristic-looking plaza will be transforming the Florida waterfront from 2018 and to reach it, you have to walk into the sea. But fortunately, you won't get wet as the whole complex will be set on a floating base that's inspired by the technology used on submarines. Currie Park (main) will occupy a 19-hectare vacant area off the coast of Lake Worth Lagoon in West Palm Beach. As well as featuring restaurants (right inset) and shopping areas (left inset), the huge complex will also have events at the auditorium and a circular pool that overlooks the sea.

Acting as both an expedition guide and drone pilot, Christopher Horsley, 24, from Lancashire, photographed his camping trip to Marum, an active lava lake of Ambrym, Vanuatu.

Social media sensation Crusoe, the dachshund who has over 1million Facebook followers journeyed to Banff National Park in Alberta, Canada, to soak up some natural beauty.

New York-based Baltia Air Lines was founded in 1989 and until recently it had just one aircraft. But now it's lost that. However, it does at least have a frequent flier club called the Golden Rooster Club.

A discussion on a US thread gave rise to some unsavoury anecdotes - unwashed blankets and filthy drinking water, for example - but also some useful insights on air travel.

The world's most bizarre airports revealed

Want a journey that really is more interesting than the destination? Then you might want to fly to one of these bizarre airports. In the North Pole there's an airstrip built on floating ice and in South Africa a runway with a 2,000ft drop at the end (inset). And if movie star John Travolta invites you to his Florida property, you've got the option of taking a private jet right to his front door (bottom left). Other unique airports revealed by MailOnline Travel include an airstrip built 2,221ft above sea level in a mountainous region of China (top left), a desert airport built once a year for the Burning Man Festival (top right) and a runway built entirely on ice in Canada (bottom right).

Ride sharing company Lyft announced on Tuesday that its customers will now be able to earn loyalty points with JetBlue on journeys to and from the airport in the US.

Bab Aldonia in Cairo has set up a 'Scream Room' where customers are encouraged to make as much noise as they want to vent their frustration and the owners have even installed a drum kit.

From a screaming woman at Kings Cross, London, to a growling dog in Moulsecoomb, Sussex, here's a round-up of some of the most haunted train stations across the country.

Daily Mail's Peter Hardy rounds up the best ski deals in Europe that are available to book now as well as the latest offerings in the world of snow sports.

Photographer Michael Hughes tours the world snapping souvenirs against real-life landmarks

Michael Hughes, who grew up in London, has been touring the world and taking these whimsical photos since 1999, photographing souvenir objects in front of their real-life counterparts. Pictured clockwise from top left: The Leaning Tower of Pisa in Italy; the Houses of Parliament in London; The Eiffel Tower in Paris; the Statue of Liberty in New York; and (inset) the ancient pyramids in Cairo, Egypt.

The AirAsia aircraft was preparing for take off when two of its three landing gears slipped off the edge of the runway at a Malaysian airport and became lodged in the mud.

A new report revealed the perils of airlines' 'tick box taxing'. The report revealed a family of four can save up to AUD $871 by purchasing standalone policies and avoiding pricey airlines' insurance.

It was a blast while it lasted: Last ever KLM 747 to buzz the beach at St Maarten touches down

One of the best things about Maho Beach, for many, on the Caribbean island of St Maarten-St Martin was seeing KLM’s 747s roar overhead to the airport nearby. But the last ever hair-raising landing by a jumbo belonging to the carrier was made on Friday. Many aviation fans took to Twitter to mourn the end of the era. User Maliniak said: 'Maho Beach without [the] KLM 747 will never be the same.' Kazi Ahmed ‏wrote: 'Avgeek or not the magnificent KLM 747 at St Maarten airport was a sight to see. Sad it has been retired.' Maho Beach is one of the world’s best plane-spotting locations, with thousands of brave holidaymakers flocking there every day to stand directly under the flight path as passenger jets buzz overhead.

Fifty-nine per cent of workers admitted that they have been dishonestly insistent with their line manager that they must have certain dates approved to avoid losing money on holidays.

National Geographic showcases photographs highlighting 50 of the Earth's most scenic spots

A breathtaking new book by National Geographic showcases stunning photographs highlighting 50 of the Earth's most pristine, scenic places, including the breathtaking Skellig Islands off the coast of Ireland (main), Canyonlands National Park in Utah (bottom left) and a volcanic crater lake in Iceland (bottom right). MailOnline Travel has assembled a selection of some of the most striking landscapes featured in the book named, appropriately, Wild Beautiful Places.

In a survey of 2,000 people across the UK, 28 per cent chose the Great Barrier Reef as the landmark they would most like to wake up to, followed by the Eiffel Tower and The Sydney Opera House.

The Dept of Commerce says 74m US residents travelled internationally in 2015 - a 9% rise on the previous year. Of those, 33m travelled overseas, with the UK the most popular destination.

From pointing in Malaysia to insulting Peruvian cuisine, residents have taken to online forum Quora to warn tourists of the things they should avoid doing when visiting their country.

Travellers have revealed the items they've had confiscated at UK and US airports. One man was told his spiky earring counted as a weapon, another, a pilot, was told his hummus counted as a liquid.

'Dad of the year' hands out sweets to plane passengers on Halloween

An American dad's actions have gone viral after he was spotted handing out sweets to fellow passengers on a plane so his three-year-old wouldn't go without the trick-or-treating experience on Halloween. He encouraged the fliers - if willing - to hand the treats he gave them to his little girl when she went around the airplane on the traditional all Hallows walkabout on the Boston to San Francisco flight.

Go-Ahead Group said that trading remained ‘robust’ in the three months between July and September except for its Govia Thameslink Railway, which owns Southern.

The world's best 'Airbnb' boat deals revealed

The saying goes that 'a boat is a hole in the water in which you pour money' and many boat owners frequently bemoan the lack of use their vessel gets. However the increase in peer-to-peer online marketplaces over the past three years has seen recreational boaters matched with boat-owners, chartering companies and captains. In short it's just like house-sharing website Airbnb - but for boats. Owners see their ships get the love and use they deserve while renters get to try out new sailing experiences, from submarines to superyachts. MailOnline Travel has rounded up six of the top companies that can match you with just the boat you need for your trip away. Top left is a superyacht from The World Is Not Enough, top right is the brand new Hanse 505, available in 2017, bottom right the schooner that featured in The Rum Diary starring Johnny Depp, bottom left is a high-tech luxury offering from Sail and inset is a yellow submarine in Liverpool you can stay in for just £62 per day.

Locals and tourists have been sharing facts about Switzerland that need to be seen to be believed including how clean the water is and how fancy the crossings are.

The Gujarat forest department has warned against people taking photos with lions in the background after reports emerged of a surge of night-time shots on social media.

The world's most beautiful pagodas revealed

Adorned with gold leaf and intricate embellishments, the pagodas peppering Asia are wonders to behold. From the 14th Century Gyeongbokgung Palace in South Korea, to the Shwedagon Paya Pagoda in Myanmar - decked out with almost 5,000 diamonds - all of the temples have a common theme: peace and tranquility. Along with the bold design, the pagodas are also impressive for their sheer size. Top right is the pagoda at Meidai Lamasery Inner in Mongolia, bottom right Chureito Pagoda Fujiyoshida in Japan, bottom left Thambuddhei Paya Pagoda in Myanmar, top left Shwedagon Paya Pagoda in Myanmar and centre is Gyeongbokgung Palace in Korea.


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