An ode to one of the first concerts broadcast via satellite.

A series of playful yellow penguins share a serious message about the environment.

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

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This former quarry is now a picturesque gorge that hides a sunken lake.

A spiral staircase twists to the top of this unusual Czech lookout tower.

A saintly relic hidden in a Prague church basement.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

An Orwellian sculpture with eyeball cameras watches passersby.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

This remote church calls a tiny island its sanctuary.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

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

A slice of central Asia in the middle of Berlin.

A Belle Epoque bordello turned into a themed love hotel.

Inside a former cabaret, seven floors of erotic art.

The largest medical and anatomical collection in France lies hidden from the public.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

A mechanized clock where a man fights off a dragon, crab, and rooster.

The heaviest gold coin ever minted.

This facility has manufactured stunning tapestries for France's royalty ever since the 17th century.

A museum dedicated to linguistics, from how babies learn to talk to endangered and extinct languages.

This mural painted by Keith Haring was done without payment as a gift to entertain the children at the Hôpital Necker.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.