I don't currently have the server capacity to host the data for all countries in the database but you can download a copy if you wish. It's about 5.5 million records (~1GB) in all. Of that ~2.7 million (450 MB) is cities and towns. The remainder is physical features.
The international data comes from the National Imaging and Mapping Agency (NIMA). A description of the fields is also available.
The US data comes from the United States Geological Survey. The record layout is also available.