Week-long block party becomes a competition for the best decorated street.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

The cave where Saint Genadio meditated and played chess.

This remarkable museum sprung from one of the most important prehistoric archaeological sites in the world.

Abandoned 18th century weapons factory in the Aezkoa Valley.

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

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

The world's largest reflecting pool is just two centimeters deep.

Abandoned railway line circling the city of Paris.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This Parisian café sticks almost exclusively to an ethos of reuse.

A museum of magic with a Sadist past.

France's national museum of scientific and industrial instruments.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

A subterranean shelter remains intact under a busy Paris railway station.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

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

This Parisian fountain is a little bit fantasy and a little bit nightclub.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

A unrivaled and rather horrifying collection of wax dermatological models.