Roswell, New Mexico, has become synonymous with the search for aliens after a UFO supposedly crashed there in 1947. A ranch worker made headlines when he claimed he found debris from a flying saucer crash. The U.S. government explained the incident away as a crashed weather balloon, though some people didn’t buy this explanation. Since 1996, thousands of people have descended on Roswell for the city’s annual UFO Festival, one of America’s coolest festivals.