The highest waterfall in Italy is only "turned on" five times a year.

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

The world's most active stratovolcano is almost always erupting.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This bridge was constructed from the rubble of the infamous Bastille.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

The fairy tale castle of the "fairy-tale king."

The prototype for all Nazi concentration camps.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

A close look reveals that the Scottish monument is just slightly off-kilter.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.

Largest lake in Great Britain measured by surface area.

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

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

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

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.