Photo credit to Rohit Gowaikar and used under the linked agreement.
Rising up to 2300 feet, Kalavantin Durg is older than it is tall. The fort is not much more than a cave built on the pinnacle of the jutting stone that gives a spectacular view of the surrounding lands, which is probably what it was built for. It's said, though, that it was built for a princess or, possibly, a queen: Kalavantin, but there are no historical records to back that up. The only up to the fort is the "Climb to Heaven," narrow, hand-carved stairs that take hours to climb.
Photo credit to [selvin] and used under the linked license agreement.
As an added bonus, the ghost town Kolmanskop:
Kolmanskop is located in the Namib desert much in the same way as the diamond that caused it to spring into existence: it was just lying there. A railway worker found it in 1908 and turned it over to his German supervisor, leading to a flood of German diamond miners and a quickly flourishing town. But the field was mostly depleted by the end of World War I and completely abandoned by the 1950s. Since then, it has been featured in a number of films and TV shows.