The man who introduced reinforced concrete to the world demonstrated its genius by using it to build his own house.

Exquisite examples prehistoric bas-relief carvings.

A French artist's vague warning hangs over Belleville.

Beneath the city of Lourdes, France is a massive, concrete church.

His "Lionheart" is entombed separately from the rest of his body.

1920's reinforced concrete church by architect Auguste Perret changes the face of modern design.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

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

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

This French "sea of rocks" is packed with stunning rock formations and its own medieval castle.

Fighting the British and making game shows for over 150 years.

One man's desire to transcend art led to the construction of this outsider chapel.

Walk through living pictures and music in the Cathedral of Images.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

This tiny hotel perched atop a 50-foot tower really puts things into perspective.

100-windowed castle turned art gallery, built by one dedicated mason.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Legend has it this 11th-century castle was paid a visit from the devil.

French commune at the heart of conspiracies.

French Time Capsule-19th Century home revealed to the public.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

Artist and musician Will Menter creates musical sculptures.

The ruins of a medieval castle linked to the murderous French lord that inspired the famous legend of Bluebeard.