This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

One of the notorious Soviet leader Joseph Stalin's many summer retreats.

Remnants of the Roman empire's northern frontier nestled in suburban Glasgow.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

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

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

Enjoy fresh-baked bread and fish from a repurposed Portuguese fortress.

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

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

An eerie former warehouse turned cistern turned movie set.

Crumbling necropolis set high above Fez.

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

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 other side is actually green.

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

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

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

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

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The oldest candy store in the world has been selling traditional sweets since 1827.

Eyam took steps to quarantine themselves and keep the plague from spreading.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

Inside this museum is an ongoing excavation of an ancient shipwreck.