17. El Hotel del Salto, Colombia
During the Roaring Twenties, this structure was built as an architect’s mansion—one that would make Gatsby gawk. Since then, the cliffside structure has has a few major makeovers. It became the 18-story Hotel del Salto in the 1950s, but was abandoned shortly afterwards and left to collect moss and tales of ghosts and hauntings. It was most recently converted into the Tequendama Falls Museum.
18. Kangbashi, Ordos, China
Welcome to the most modern ghost town you’ll ever see. Located in the city of Ordos (a subdivision of Inner Mongolia), Kangbashi New Area was intended to be a 130-square-mile residential area built to accommodate some one million people. Construction of the futuristic city-within-a-city began in 2003, but city officials had trouble filling the super-expensive apartment buildings—and the remote desert location certainly didn’t help matters. It’s almost as if Kangbashi were built for a Ridley Scott movie, and then completely abandoned once shooting ended. Visitors are still free to visit the area today, and wander through the surprisingly intact buildings and art installations.