A once-fairy tale mansion now stands in a state of disrepair.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

Fantastic lake on the heart of a fault line.

The only residents of this abandoned housing development full of identical castles are stray cats and dogs.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

This ancient abandoned church in a remote part of Turkey is in danger of falling over.

An abused and forgotten metropolis, abandoned for centuries.

Remnants of successive wars and Muslim colonialism in the 11th century.

The observation point offers spectacular views of the ruins of an ancient Armenian capital.

A Turkish monastery tucked into a cliff wall.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

"Holy Wisdom" overlooks the city that became its namesake.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

The unusual sculptures are believed to be powerful political symbols.

One of Belgrade's most beloved animals.

A Serbian church lit by chandeliers made of weapons.

Considered an architectural abomination by some, this metal-clad building is known as 'little red riding hood' by locals.

This beautiful spit of land was once the summer playground of the king of Spain.

The camera-toting gargoyle juts out from the exterior of a Gothic cathedral.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

This stucco building in North Africa was the first American-owned property on foreign soil.