The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

This collection of French root art looks like an indoor fairy wonderland.

The world's tallest bridge is also possibly the most elegant.

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

A self-built mosaic house and sculpture park.

Museum in a swimming pool where the water still flows.

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.

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

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

Beautiful carved tunnels.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

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

This professional clown's home is an outsider art wonderland.

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

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

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

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

This massive blockhead sculpture hides an entire library.

Historic medieval fortified city in southwest France.

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