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

Traditional 11th-century outdoor tannery.

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

The history of the oldest fort in Baltistan is steeped in familial rivalry and gruesome deaths.

This Paleolithic cave may be the oldest cemetery in North Africa.

A memorial to the atrocities of the People's Socialist Republic of Albania.

Hidden among Rawalpindi’s modern buildings are the remains of dilapidated Hindu temples.

Hues of distinctive blue to bluish-green color the slopes of these hills.

This market built by German prisoners of war is made of local stones.

Just off the road outside Baguio, a gigantic lion's head carved into a mountain greets those driving by.

At an altitude of 3,700 meters, this is the highest polo field in the world.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

Be careful not to get trampled at this lively two thousand-year-old market.

The caskets in this graveyard have not been opened—they have always been open.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A giant scrawl on the skyline of south London.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

Heralded as the oldest statue in London.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.