Defending the entrance into Provence for more than 400 years, the Citadel of Sisteron is a fortress with a unique silhouette that is one with the rock. The guardian of a natural door of titanic proportions, it is built on both sides of a particularly steep rocky ridge. How did the builders manage to turn this constraint into an asset? What techniques did they use to erect colossal platforms on the steep slopes, nested in each other? On what vestiges of the past did they rely to shape this marvel of military architecture?
Thanks to the original blueprints along with 3D CGI, we discover the technological breakthroughs that led to the creation of the Citadel of Sisteron, from the high towers of the Middle Ages to the immense underground staircase dug into the rock in the 19th century. Embark on a journey of nearly 600 years through the evolution of fortification.