A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

The oldest known university in the world is in Fez, Morocco.

Traditional 11th-century outdoor tannery.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

God's Saharan sandbox of wrath.

Vast stretch of tide-pools with a unique Moroccan charm.

A fortified city, home to a remaining population of five families

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

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

The largest volcanic caldera in Japan holds an entire city in its maw.

Steaming blood-red hot spring from hell.

A battle between nature and architecture in the Cambodian jungle.

Built by King Norodom to honor his late father.

Believed to have once stored either human remains or rice wine, thousands of mysterious stone jars lie in ruin.

Medicinal spa created with the discharge from a geothermal energy plant.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

Staves, storm-calling, and of course, necropants.

An encyclopedic collection of mammal penises.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

A sulfuric martian landscape that looks far better than it smells.

This elegant arc of a waterfall marks a religious turning point.