Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

These quaint French houses dangle precariously over a precipice.

An ancient monastery, a locked room, and a mysterious book heist.

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

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

An aluminum skeleton brings Chinese mythology to the French shore.

Ghosts of France's colonial past.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Historic medieval fortified city in southwest France.

An icy lake tucked among jaw-dropping alpine panoramas.

The largest underground church in Europe.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This massive blockhead sculpture hides an entire library.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

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

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The first green space constructed on an elevated viaduct.

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

One of the greatest maze designer’s greatest mazes.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.