This single-track road rewards brave drivers with stunning Scottish scenery.

A cheeky architectural easter egg.

Village situated on a narrow volcanic escarpment.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

The hallucinogenic center of the ancient world.

An encyclopedic collection of mammal penises.

Called the "Armenian Stonehenge," this ring of menhirs pierced with holes may be a prehistoric astronomical observatory.

A sophisticated astronomical tower built by one of the greatest Persian scholars of the Islamic Golden Age.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Believed to hold the remains of Japan's most infamous fox spirit, this stone is said to kill those who dare approach.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

The long-lost final resting place of an accused witch.

George Lucas donated this park to honor the birthplace of his two biggest movie franchises.

Houses are tucked between, on, and underneath giant boulders.

The memorial honors the lives of rhinoceroses killed by poachers.

One of the best-preserved medieval streets in Europe.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

A Jenga-style cylindrical tower of books that appears to go on forever.

This psychedelic tourist trap is a leisurely descent into madness.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

Hamburgers are intensely proud of their tunnel beneath the river.

The romantic botanic tunnel feels like a well-kept secret.