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

A tiled, multi-level garden of survival in Lyon.

A self-built mosaic house and sculpture park.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

Sleep in a climate-controlled plastic bubble for the night.

Ordinary art transforms to extraordinary thanks to locals' quirky sense of humor.

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

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

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

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

Museum in a swimming pool where the water still flows.

Former hunting lodge of a duke who was an avid collector of impressionist works.

The tomb of history's greatest potato promoter is surrounded by tubers.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

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

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

One of the oldest masonic museums in Paris.

The world's largest reflecting pool is just two centimeters deep.

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

Two small chapels housed inside an ancient tree.

Beautiful carved tunnels.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

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

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