A precariously balanced goose-shaped boulder with a dark legend.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Mountain where Jesus was first tempted by the Devil.

This cemetery features modernist statues as strange as its name.

A beautiful but toxic fountain of mercury.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

One of the tallest mountains in India was closed for years after a botched CIA mission.

A collection of art from Bulgaria's time as a communist state.

A collection of miniature, symbolic sculptures hides in plain sight across Kyiv.

A hidden art gallery in an abandoned Warsaw fort.

The deepest metro station in the world.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

The relics are stored in a silver reliquary, where they can be seen through glass.

Disturbing works of outsider art, carved from whole logs.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

Once a prosperous mining village, this tiny Taiwanese town is now overrun with cute cats.

A secret passageway from World War II is now a quirky pedestrian shortcut.

Life-size animals and furniture made entirely from cardboard fill this odd paper-themed restaurant.

A hotel in Taiwan based on the better business practices that can be gleaned from Jewish law.

A plaque by the roadside describes a three-dimensional glossary of an imagined language where words are numbers and numbers are words.