A massive natural rock arch gives the Tuscan mountain its own window to the sky.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

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

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

This extraordinary geological oddity resembles human-made pavement.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

This deceptively beautiful island was once home to a German concentration camp and known as "Death Island."

The walls and streets of the ancient city are peppered with penises.

An abandoned 17th-century baroque hunting lodge with a wonderfully strange architectural plan.

This amazing 15th-century mural remained hidden in plain sight for centuries.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

No one's quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

You can row a boat through this ancient underground reservoir.

A CT scan revealed the identity of this 3,000-year-old mummy that everyone erroneously thought was female.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

Rare recess caves fill this unbelievably beautiful Ohio park.

The mass grave of the 27 victims of the "Vampire of Hanover."

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

Cornish legend says these ancient circles were people turned to stone for playing hurling on a Sunday.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

Just saying the name of this town out loud is said to bring bad luck.