Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

The first green space constructed on an elevated viaduct.

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

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

The curious underground history of keeping Paris clean.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

The history of radiation is on safe display at the foot of a radiation science laboratory.

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

France's national museum of scientific and industrial instruments.

A mechanized clock where a man fights off a dragon, crab, and rooster.

A museum of carnival attractions where you are invited to ride the rides.

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

One of the oldest medical collections in Europe focusing on rare surgical instruments.

Abandoned railway line circling the city of Paris.

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