Crumbling necropolis set high above Fez.

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

Founded as a refugee camp, now a popular tourist spot.

Something's watching you.

Otherworldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Don't blink or you'll miss it.

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.