Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

A curious collection of locks and keys.

The celebrated eyesore created by starry-eyed sweethearts.

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

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

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

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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

A subterranean shelter remains intact under a busy Paris railway station.

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.

Statue of death tucked in the University of Medicine courtyard.

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

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

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.