The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

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

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

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

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

Abandoned railway line circling the city of Paris.

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

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

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

Notorious artist squat renovated into legal studios.

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

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.

This spectacular bridge is part of an abandoned train line that once connected Mallorcan capital to the southeastern coast.

These wooden balconies that are both decorative and functional.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

This influential Renaissance-era library was once the haunt of kings and monks.

Medieval ruins nestled within a breathtaking swath of Spanish nature.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

Whimsical sculptures and caves chiseled by nature over the millennia.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.