The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

Home to items never before seen by the public.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

This Parisian café sticks almost exclusively to an ethos of reuse.

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

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

This bridge was constructed from the rubble of the infamous Bastille.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

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.

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

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.

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

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

This tiny cottage surrounded by railroads is the oldest surviving structure in Fairmount Park.

The summer home of the largest colony of bats in the world.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

One of Philadelphia's largest murals resides hidden under this bridge.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.