This still-operational Air Force facility, known as Area 51, drew attention during its Cold War-era aircraft testing, spawning rumours of sinister experiments, a staged moon landing and a lab run by aliens. It’s strictly off-limits, of course, but that doesn’t stop people flocking to the area hoping to catch a glimpse of something a little alien (or perhaps just of a little alien). It’s along the Extraterrestrial Highway, as Route 375 was officially named in 1996 following numerous UFO sightings. Highlights include the Alien Research Center, a metal hangar stuffed with curios and gifts and guarded by a 35-foot (11m) tall alien.