This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

Hungarian mummies in beautiful painted coffins.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

Museum dedicated to the terror regimes of Hungary.

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

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

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

Dubbed "Wistom" by locals, this abandoned factory is an urban explorer's dream.

The two abandoned overpasses are among the largest bridges in Poland.

This imposing 20th-century castle was abandoned before it was ever completed.

A national collection of Communist-era musical posters.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

Naturally formed rock city in Poland.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Wheels of chrome by the thousands adorn this California Historical Landmark.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.