A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

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

The curious underground history of keeping Paris clean.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

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

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

Site of a classic 19th-century physics experiment to prove the earth is rotating.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

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

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The medieval woodcut-style artwork chronicles life in medieval London.

A mysterious shape catches the eye in this 16th-century painting.

Where's a guy to go after a long, hard day at work?

This ancient Egyptian obelisk still bears the wounds of World War I.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

The ritual has been performed uninterrupted for nearly 700 years.

A plaque marks the underground site of one of London's "lost rivers."

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.