Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

This statue honors the thousands of Allied avians that served and died for France during World War I.

The eclectic observatory castle of a 19th-century astronomer and explorer.

Lady Liberty's original designer installed a little clone in this French fountain.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Science fiction's grandfather has a fittingly marvelous tomb.

The first green space constructed on an elevated viaduct.

Ancient paintings known as the "Sistine Chapel of Cave Art."

One of the greatest maze designer’s greatest mazes.

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

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

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

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

How did a French journalist’s grave become the sexiest statue in the cemetery?

This Parisian café sticks almost exclusively to an ethos of reuse.

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.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

This museum houses an imposing skeleton army comprised of creatures great and small.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

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

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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.