The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

The city walls of Salé lead to the ruins of this seaside "bastion of tears."

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

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

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

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.

God's Saharan sandbox of wrath.

Initially meant to immortalize the valor of the colonizer, this monument is now a symbol of Mauritanian resistance.

Thousands of colorful pirogues showcase ingenious craftsmanship at the largest fishermen port in Nouakchott.

A geological bull's-eye visible from outer space.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

An architectural relic that survived the hands of time.

This remarkably well-preserved mosque stands amid an 11th-century caravansary.

The world's newest astronomical clock is also its most accurate.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

Romania's only crater lake with water as pure as if distilled.

Gigantic Romanian salt mines used to heal respiratory conditions.

This fortress-like monastery is covered with intricate frescoes.

Massive, unfinished broadcasting station stands as a monument to the fall of communism.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.