Hear the quietest sound from across the dome.

The oldest working mechanical clock in the world.

Famously misunderstood wonder of the ancient world

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Berlin's old airport.

Cold war icon and onetime "hole" in the iron curtain.

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

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

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

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

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

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

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

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

The celebrated eyesore created by starry-eyed sweethearts.

This museum houses an imposing skeleton army comprised of creatures great and small.

A haunting collection of the vanished and disappearing natural world.

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

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

Large Hadron Collider and the Birthplace of World Wide Web.

Artworks by loners, prisoners and the criminally insane.

Tucked in the back of this amazing antique store is an important piece of medical history.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

A Beaux-Arts triumph set to become Ford's innovation campus