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

This bridge was constructed from the rubble of the infamous Bastille.

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

The narrowest street in Paris.

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

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.

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

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

This 18th-century sundial was designed to calculate the date of Easter each year.

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

Saintly bones pressed into a wax effigy of a Catholic superstar.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

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

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

A complicated contraption for telling time by the moon.

One of several Lilliputian portals that are ready to transport passengers to other dimensions, if they can find them.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

A monument to one of the most famous modernist Chinese poems and its poet.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

An ordinary lamppost situated in the middle of Cambridge has an unusual moniker and history.