Where Venice's gondolas go for a tune-up.

Go inside to really appreciate this 500-year-old technological masterpiece.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Copenhagen's celebrated theme park and gardens.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Amsterdam's Red Light District leaves little to the imagination.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

This tremendous timepiece was once the largest cuckoo clock in the world.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

This cave holds a surprisingly colorful variety of geological oddities.

A bizarre house filled with an astounding array of collections.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A historic coal mine that doubles as a museum and tourist attraction.

Home to items never before seen by the public.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.