Indents in the pavement are all that remain from a grisly death machine in Paris.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

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

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

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

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

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

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

A surrealist timepiece by the artist of melting clocks.

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

The narrowest street in Paris.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

The oldest stone house in Paris was built by its most famous alchemist.