Nullarbor Plain, Australia

This remote area in the Australian Outback has been a UFO hot spot since the 1950s, when the British military started atomic bomb tests here. Many travellers crossing this desert-like area have complained of being chased by UFOs. With reports of alien abductions circulating, the government erected a "Beware of UFOs" highway sign.

https://www.msn.com/en-us/news/photos/extraterrestrial-thrill-19-ufo-hot-spots-around-the-world/ss-BBH0oAT?fullscreen=true#image=4