God's Saharan sandbox of wrath.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

The oldest monument in Marrakesh and the city's only surviving example of Almoravid architecture.

Morocco's largest Jewish cemetery.

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

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

One of the most spectacular canyons in the world.

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

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

Washington's iconic carousel has a nice piece of Civil Rights history.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Home to items never before seen by the public.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The house where John Wilkes Booth conspired with his co-conspirators.

Decades before the scandal, this staircase on the river was a literal "water gate."

Parking garage where Bob Woodward met Watergate source "Deep Throat."

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.