Two grand "World's Fairs" have largely defined Balboa Park. The California Building and Quadrangle, the Administration Building, the Botanical Building, the Spreckels Organ Pavilion and the New Mexico Building remain from the first exposition, as do four temporary buildings that have already been rebuilt. Administration Building Botanical Building California Building (Museum of Man) Casa de Balboa (Historical Society, MOPA, Railroad) Casa del Prado Federal Building (San Diego Hall of Champions & Breitbard Hall of Fame) Ford Building (Aerospace Museum) Home Economy / American Legion Building (demolished) House of Charm (Mingei Musuem) House of Hospitality (Prado Restaurant) New Mexico Building (Balboa Park Club) Science and Education Building (demolished) Spreckels Organ Pavilion More on Balboa Park from the Journal of San Diego History: San Diego's City Park, 1868-1902: an Early Debate on Environment and Profit Balboa Park, 1909-1911: The Rise and Fall of the Olmsted Plan The Persian Water Rug Fountain: Balboa Park's Lost Treasure Byways of Old City Park Samuel Parsons Finds Xanadu in San Diego The Southwest on Display at the Panama-California Exposition 1915