One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

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

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

Crumbling necropolis set high above Fez.

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.

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

The other side is actually green.

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

This demon atop the Notre-Dame de Paris looks utterly bored.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

The curious underground history of keeping Paris clean.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The world's tallest carillon is located at the top of this skyscraper in Mexico City.