This statue was given to France by the United States to commemorate the centennial of the French Revolution.

The curious underground history of keeping Paris clean.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Indents in the pavement are all that remain from a grisly death machine in Paris.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

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

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

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A haunting collection of the vanished and disappearing natural world.

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

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

Abandoned railway line circling the city of Paris.

Notorious artist squat renovated into legal studios.

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.

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

A Victorian school for poverty stricken waifs has been preserved as a museum to their donated education.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

Residential building on the Regents Canal is a breeding ground for creativity and innovation.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

Three small rooms at the back of the “official” church of London's clowns.