11. Chile's UFO Trail

Chile is famous for UFO sightings… which is why the country's tourism board built the UFO Trail, where adventurers may (or may not) get to see an ET. For serious enthusiasts only, the trek includes four hours on horseback above 10,000 feet before hiking the 19-mile trail. But even if no UFOs show up, hikers will find themselves on a landscape consisting of 200 perfectly sliced granite-like blocks, thought to be a landing site for ancient astronauts.