Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

No shoes allowed on this trail, which is designed to be experienced barefoot.

A frozen oasis lies beneath the scorching New Mexico desert.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

A unique rock formation that only a few have managed to venture inside.

This rock in the middle of a river in Jayuya contains dozens of Pre-Columbian Taíno petroglyphs.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

Made famous by "Star Wars," these troglodyte homes face an uncertain future.

A fortress-like granary that has been continually in use for more than nine centuries.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

More than 1,000 stone figures were discovered in a small Nigerian town, where they had been sitting for centuries.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

A medieval church built up to defend its village.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

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

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

Generations have refused to move this doll from its dusty resting place to preserve a castle from a watery fate.

The second-largest natural arch in the Chartreuse Mountains.

The precise origins of this pink sandstone temple are unknown.

A small house sits between two huge rocks, with its back to the sea.

Journey through the ruins of this ancient Roman temple dedicated to the god of war.