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

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

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

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A chemical factory damaged by two earthquakes and an explosion that became abandoned after bankruptcy.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The Natural History Museum that time forgot.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This Transylvanian church has changed its denomination four times.

On high feast days, the entire blue-glass front of this modern church opens up to reveal the small wooden church inside.

An Orthodox church inside a small "Garden of Eden" built by a man who had a vision.

The unusually large seat sits atop the base of a ruined temple.

German-style coffee and cake, just like Oma used to make it.

This airport currywurst stand is made out of retro airplane parts.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

King Ludwig I's collection of beautiful women.

A subterranean display of public art and architecture.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

A fearsome dragon clings to a corner of Munich's city hall.