The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The United States Capitol's former columns still stand.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

The designated Jewish quarter in Fez dates back to the 15th century.

This restored 17th century synagogue is one of the few remaining structures in Morocco’s ruined Jewish quarters.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

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

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

Traditional 11th-century outdoor tannery.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

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

Crumbling necropolis set high above Fez.

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

The other side is actually green.

One of the most spectacular canyons in the world.

God's Saharan sandbox of wrath.

Mosaics, storks, and brothels—this ancient city has it all.