It's top-secret military installation in the Nevada desert off Highway 375. UFO buffs believe that the United States Air Force holds captured spaceships there.
In public, the USAF does not even call it Area 51. This secrecy is proof to those who insist they have seen unexplained lights or ghostly blurs in the sky.
The 375, now renamed the Extra Terrestrial Highway, sweeps through Nevada's high desert. It is bleak and unforgiving.
The road was renamed after a series of UFO sightings in the early 1990s. Governor Bob Miller agreed ' to boost tourism. Locals are already doing a brisk trade in T-shirts, keyrings, and alien figures.
Trespassers around the base are arrested instantly and usually fined several hundred dollars. Signs around the base warn of 'deadly force' to keep intruders out.
All of this adds to the conspiracy theory. The most likely reason, though, is that the US government is testing aerospace technology. For years the F-117 Stealth bomber was tested through the nearby mountains. A very different sort of UFO ' and a good reason for secrecy.