The most accurate timepiece in the world.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

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

The celebrated eyesore created by starry-eyed sweethearts.

The final resting place of the "father of special effects."

This demon atop the Notre-Dame de Paris looks utterly bored.

The tomb of history's greatest potato promoter is surrounded by tubers.

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

What looks like a normal building is really a hollow facade hiding a subway vent.

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

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

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

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

This banal Parisian entranceway is not what it seems.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

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

The curious underground history of keeping Paris clean.

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

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

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

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

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

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