The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The world's longest continuously running show has played at this small West End theater since 1974.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The narrowest street in the world is in danger of closing up entirely.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

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

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

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

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

The video game-themed street art first popped up in the French city.

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

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

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

The celebrated eyesore created by starry-eyed sweethearts.

Slyly buy a shake in the Parker Meridien lobby.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

A historic arena where the Beatles played their first concert in the U.S.