A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Paris' linguistic guide to the international language of, yes, love.

France's national museum of scientific and industrial instruments.

A mechanized clock where a man fights off a dragon, crab, and rooster.

Abandoned railway line circling the city of Paris.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Crumbling necropolis set high above Fez.

Traditional 11th-century outdoor tannery.

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

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

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 largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

Bizarre living fossil only grows in a small chunk of the Namib Desert.

The remains of diamond fever taken over by the desert.

The largest known meteorite on Earth was too big to move.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

The once highest point in China blends symbolic design with a kick of adrenaline.