This Denmark theme park is part family attraction, part experimental archaeology project.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This medieval village/restaurant perpetually celebrates the year 1376.

Dioramas and animatronics lead you through the story of Bhagavad-gita, the Indian literary classic.

Home to three historic ships from the age of Vikings.

Fine dining 20 feet below the surface in the Indian Ocean.

A subterranean playground in an abandoned slate mine.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

Just outside of Nairobi lies a large estate surrounded by endangered Rothschild giraffes, who have been fed from the window by Mick Jagger and Walter Cronkite.

Go inside a revolutionary, cage-less zoo where 35 species live and some of them roam free alongside their human visitors.

The world's northernmost aquarium looks like it has fallen over.

This aquarium has almost as many world records as it does fish.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

The only surviving prototype for Buckminster Fuller's house of the future.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The world's first interactive human body museum also serves as a chair for a giant orange man.