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.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

Notorious artist squat renovated into legal studios.

The celebrated eyesore created by starry-eyed sweethearts.

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

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

The first green space constructed on an elevated viaduct.

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

Abandoned railway line circling the city of Paris.

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

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

Climb inside an iron crystal magnified 165 billion times its normal size.

The taxidermied remains of a once-great parrot.

This hidden green space is the city's second largest conservatory.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

A quiet memorial to those who died saving others in the heart of the City of London.

Pop culture has helped to keep this iconic British building from being destroyed.