French commune at the heart of conspiracies.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

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

France's high-tech, future-themed amusement park.

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

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

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

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

Figures of unknown origin carved into the surfaces of underground caves.

An architectural oddity of six stories, accessed by graceful ramps.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

The construction of a tram line unveiled hidden remnants of the old medieval city.

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

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

A French library that makes sure its love of books is writ large... giant in fact.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.