A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

A medieval church built into an ancient cave.

Peeing dogs guard the Roman hunting goddess atop a fountain at France’s Château de Fontainebleau.

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

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

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

A place to see how French aristocrats lived in the early 1900s.

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

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

A huge Megalithic chamber tomb located behind a cafe.

Perfume museum and library.

Claude Monet was baptized in this lavishly ornate Paris church.

France's high-tech, future-themed amusement park.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

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

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

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

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

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

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

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

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