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 other side is actually green.

One of the most spectacular canyons in the world.

Morocco's Argania trees are infested with nut-hungry goats.

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

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

A fortified city, home to a remaining population of five families

A mud brick kasbah with a history of lavishness and traitorship.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Where commuters walk through remnants of an ancient Greek necropolis.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

This amazing mountain temple is topped by one of the tallest sitting Buddha statues in the world.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Climb to the top of the world's largest seated bronze Buddha.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

Sculpture of a legendary French dragon.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.