At its peak, under Napoleon, the French territory was three times as large as it is today thanks to the emperor's very successful military campaigns. What was his secret?

The Paris Commune was one of the first extensively photographed revolutionary movements. In its infancy, photography wasn't able to capture motion, but professionals from both sides understood the power of images and used them to convey their own visions of the events.

Lionel is in the town of Grand, a Gallo-Roman city whose origin is puzzling, as there was no main source of water in the area.