The beautiful baroque library of the Hapsburg empire.

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

This doorless 20th-century elevator doesn't stop or slow down.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A Jenga-style cylindrical tower of books that appears to go on forever.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

A museum in the childhood house of a medical pioneer.

A medieval church built up to defend its village.

The Natural History Museum that time forgot.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

A meow-velous tribute to a beloved street cat, made famous on the internet.

An abused and forgotten metropolis, abandoned for centuries.

This famous city eluded concrete detection until the early 2000's.

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

Mausoleum and Holy Seat of Antiochus I of Commagene.

The largest volcanic caldera in Japan holds an entire city in its maw.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.