Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

A formerly opulent Italian village is now a crumbling ghost town that no one really knows what to do with.

Abandoned medieval hill town.

This ghost town in Belgium will lose its street art when it ceases to exist.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

A Romanesque tower appears when water levels drop.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

A striking symbol of the Bulgarian capital.

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

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

A miniatures park with a model of Wolf's Lair as it looked during World War II.

An Italian hillside ghost town.

An apparition of Virgin Mary in Herzegovina.

142 ceramic steps become a mosaic once a year.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

A towering baroque basilica jutting out of the French countryside.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

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

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Unchanged for centuries, this medieval library keeps its books in chains.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.