The San Luis Valley, a high-altitude basin in southern Colorado, has been a magnet for UFO sightings since the 1960s. Locals report glowing orbs, hovering craft, and mysterious cattle mutilations across the vast ranchlands. The phenomenon was so persistent that a local UFO Watchtower was built near Hooper, where visitors still gather to skywatch. With thousands of reports over decades, the San Luis Valley is considered one of America’s most active UFO hotspots.