Time stands still at this serene burial ground in the center of Budapest.

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

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

Budapest's Communist-era statues, banished to the suburbs.

Museum dedicated to the terror regimes of Hungary.

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

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

A museum in the childhood house of a medical pioneer.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

Cold war icon and onetime "hole" in the iron curtain.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The most visited, and possibly most controversial, museum in Germany.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Metro station with a claim to rock n' roll fame.

Started as a kitchen garden, now the second largest botanical garden in the world.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

A downtown park built on top of unclaimed graves.

A popular swimming hole that hides one of America's most deadly diving spots.