As so often with a location that seems too good to be true, Sisteron has lived through ages of being a fortress of ultimate defense to a target of ferocious attacks. Since its existence in Roman times, the town has been regularly sacked, burned, and bombed, most recently by the allied forces in World War II, and stubbornly rebuilt.
Despite all the damaging attacks, there is still some of the old to be admired in Sisteron. You can wander through the narrow winding streets and alleys of Old Sisteron, a small part in the centre of the town, or admire the medieval towers still standing, although the old walls in between are long gone.