Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

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

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

The castle where the Marquis de Sade lived out his darkest fantasies.

The Nobel-Prize-winning author of The Stranger is buried beneath a simple gravestone in a sleepy French village.

This stone memorial commemorates a group of French patriots slain by French fascists.

A French library that makes sure its love of books is writ large... giant in fact.

Now a memorial, this factory was once used as a concentration camp for artists by the Vichy government.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

Artist Danielle Jacqui decorates nearly every inch of her home inside and out with her work.

Former bridge turned into an observation tower.

This massive blockhead sculpture hides an entire library.

A medieval military street hidden beneath a charming French fishing village.

This small Spanish village still pays homage to the Spaghetti Western films that were shot there in the 1960s.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

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

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

Sleepy fishing port not included on many maps.

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

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

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

Traditional 11th-century outdoor tannery.

The other side is actually green.