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

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

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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A museum of carnival attractions where you are invited to ride the rides.

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

The oldest stone house in Paris was built by its most famous alchemist.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This record setting conveyor belt system can even be seen from space.

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

An eerie former warehouse turned cistern turned movie set.

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

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

The true depths of these stunning Moroccan caves are unknown.

The other side is actually green.

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.

Vast stretch of tide-pools with a unique Moroccan charm.

God's Saharan sandbox of wrath.

Crumbling necropolis set high above Fez.

Traditional 11th-century outdoor tannery.

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