This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Light still pours into the ruins of this ancient Islamic observatory.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

The abandoned site of the Beatles spiritual awakening and subsequent revolt.

Natural rock formation, or biblical artifact that saved Earth's wildlife two by two?

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

Once living up to its name as the grandest hotel in all of Africa, the Grande Hotel is now home to a community of squatters.

Siberian ghost town built by gulag prisoners.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Housed in an old church, this hunting museum holds a collection of mythical bird-rabbit creatures.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Once the home of a hermetic monk, this cave now houses a small church.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

A saintly relic hidden in a Prague church basement.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”