A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

The most confusing clock in New York.

Commemorating the spot where the famous scientist fed his pigeons.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

An artist's cute bronze subway sculptures belie his violent artistic past.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

New York City's smallest piece of private property.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

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

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

The narrowest street in Paris.

This Parisian gem is one of the most incredible ethnographic museums in the world.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

Former hunting lodge of a duke who was an avid collector of impressionist works.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."