Rock art near Santa Fe, New Mexico, USA

© Scott Warren/Cava

The truth is out there…. Graffiti near Santa Fe, New Mexico, USA

Evidence of ancient aliens? Unfortunately these doodles are more likely to be the etchings of a mischievous hiker. Although Pueblo cultures here in the US state of New Mexico made pictographs in this style several centuries ago, there's no evidence they were depicting extraterrestrials. But don't get us wrong: We want to believe.

Today is Extraterrestrial Culture Day in New Mexico, home to the 'Roswell incident' of 1947. Depending on who you ask, the metallic wreck found on a remote ranch in the state one July morning was either a weather balloon, a top-secret military device disguised as a weather balloon, or a bona fide alien craft. Whatever the truth, the nearby town of Roswell has gone all-in on UFO lore. It's home to numerous UFO-themed attractions, among them the International UFO Museum and Research Center.