Groom Lake Area 51 Nevada
Groom Lake commonly known as Area 51 is probably the most interesting military facility in the world. A world of secrets and mystic and 'Black Programs' some that eventually such as the U-2 and F-117A emerged into the daylight and many others that never did. With a 6-mile long runway many 'black' planes leave in the dead of the night on long-range test flights some to the UK. UFOs land there too!