This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

Rock carving created 1,300 years ago 75 feet off the ground.

Mysterious standing stone formations looks like a petrified forest.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

An ancient burial ground believed to have been used for ritual sacrifice.

This small chapel is built of human bones and decorated with a golden skeleton.

The other side is actually green.

A well-restored ancient archaeology site gives a real feel for life during the Roman age.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

"Alleys of Stone" form natural mazes in Spanish natural park.

Hidden well off the beaten path in Catalonia is this crumbling medieval castle that is slowly being covered in graffiti.

This abandoned racetrack looks like it is set to hold competitions in the apocalypse.

An independent naturist colony amidst 1000-year-old ruins.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A top secret Cold War bunker hidden beneath a Latvian spa facility is now open for tours.

Wars fought and wars won are remembered by these abandoned bunker ruins.