There has been an astronomical clock on this spot since the 14th century.

The world's largest reflecting pool is just two centimeters deep.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Two small chapels housed inside an ancient tree.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The famous winding walk at Chartres is surrounded in mystery and myth.

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

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

This Parisian gem is one of the most incredible ethnographic museums in the world.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

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

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

Hundreds of hidden passageways weave through the old quarters of Lyon.

This banal Parisian entranceway is not what it seems.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

The first green space constructed on an elevated viaduct.

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

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

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

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

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.