Places Blondin Wants to Go

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Earth's greatest purely vertical drop at 4,101 feet.

Willy Wonka would love this weird half-a-home.

Defying all odds, this lonely little tree found a home on a log sticking out of a Canadian lake.

This expansive bridge in the Canadian wilderness was originally just built for friends.

This Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

Massive installation of Europe's negative stereotypes.

A cheeky architectural easter egg.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

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

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

Mummified monks and the accidentally interred, in a 17th-century crypt.

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

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

A church of bones, decorated with 40,000 human skeletons.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

A completely underwater art museum sends a stark message about humans' impact on the environment.

Commonly acknowledged as the only public monument to the Devil himself.

A landscape decorated with enormous skull sculptures.

An architect transformed this abandoned cement factory into his castle-like workshop.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-secret storybook hedge maze is also the oldest garden in the city.