A sanctuary for wolves in a community which once trembled in fear of the murderous "Beast of Gévaudan."

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

This ancient theater was once the home of fierce gladiatorial battles.

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

The deserted pirate-themed restaurant still entices explorers.

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

Since ancient times these picturesque springs have been providing bathers with healing waters.

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

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."

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

Historic medieval fortified city in southwest France.

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

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

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

One of the greatest maze designer’s greatest mazes.

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

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

Abandoned railway line circling the city of Paris.

The place where houses are born.