These picturesque structures speckle the hill above the monastery.

Enter the deli, walk until you hit the taxidermy, then order some hot, homey guisado.

This seemingly unremarkable boulder is said to bear the hoofprint of the devil himself.

Ride the subways of yesteryear.

Love is in the air along the small street in Brooklyn.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

This museum boasts the ninth-largest collection of insects in North America.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The second largest in the world, this massive underground void has its own subway.

Small church on top of a huge rock column.

Underground monastery and fortress.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

The world's smallest commercial theater is set up in what was once a urinal for Victorian men.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A subterranean playground in an abandoned slate mine.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

When King Oswald was killed in battle, an eagle dropped his arm here creating a new spring.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A small village in two different countries.

Centuries of human activity have forged an eerie landscape of ruins and craters on an exposed and windswept hilltop.

A quiet country churchyard holds a monument to the last known sin-eater in England.