A once-fairy tale mansion now stands in a state of disrepair.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

The narrowest street in Paris.

The final resting place of the "father of special effects."

The tomb of history's greatest potato promoter is surrounded by tubers.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

Got apples?

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

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

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

A haunting collection of the vanished and disappearing natural world.

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

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

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

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 mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.