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.

This 16th-century Moroccan fortress-turned-armory museum offers prime views of the historic quarter in Fes.

Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

This former royal palace with gorgeous gardens became the first museum in Morocco.

Traditional 11th-century outdoor tannery.

Crumbling necropolis set high above Fez.

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.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

The final resting place of a German diplomat's beloved companion.

A museum pays tribute to the glass-making industry of Sunderland.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

These upturned herring boats make nifty storage sheds for fishing goods.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

One of Oxford's greatest treasures likely belonged to England's legendary King Alfred the Great.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

The fantastic charm of England's oldest botanical garden has made it a place of writerly inspiration for centuries.

England's largest white horse isn't even white.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.