A surrealist timepiece by the artist of melting clocks.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

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

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

This massive library holds what was once the largest book collection in the world.

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

Abandoned railway line circling the city of Paris.

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

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

Longest fortress system anywhere in Europe.

Humble beginnings for one of the world's most famous scientists.

The remains of a sunken military ship wreck visible through clear water.

An ethereal glowing blue ocean cave in Croatia.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

An autonomous republic of Orthodox monks.

Where commuters walk through remnants of an ancient Greek necropolis.

An alien landscape on the banks of the Aegean Sea.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.