The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

This is what trains will look like after the zombie apocalypse.

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

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

A medieval military street hidden beneath a charming French fishing village.

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

An aluminum skeleton brings Chinese mythology to the French shore.

Beautiful carved tunnels.

Avant garde house of Pierre Cardin on the Cote d’Azur.

The fantastic architectural models of a French traveler.

Two small chapels housed inside an ancient tree.

These quaint French houses dangle precariously over a precipice.

Monsters and miniatures are held in equal esteem at this wondrous museum.

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

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

The largest underground church in Europe.

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

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

An icy lake tucked among jaw-dropping alpine panoramas.

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

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