This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

A medieval military street hidden beneath a charming French fishing village.

Staves, storm-calling, and of course, necropants.

The last woman executed for witchcraft in Europe is remembered in this Swiss museum.

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

A South African bar inside a hollowed out 6,000-year-old Baobab.

The world's oldest individual clonal tree looks like a wimp despite standing tall for 9,550 years.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A pub that is literally in the middle of nowhere, but continues to do business.

The library's graceful rotunda is like a bibliophile's temple.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Light still pours into the ruins of this ancient Islamic observatory.

The world's second-largest sundial, made entirely out of stone.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A lonely beacon, precariously perched atop a remote sliver of rock.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

A sandstone block marks the alleged spot where the legendary writer was conceived.

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