The old Prisons Tower is one of the few vestiges of medieval defensive architecture in Auxerre. It testifies to the power of high, medium and low justice exercised by the abbot of Saint-Germain over an entire district of the city. On the first floor of the tower, prisoners left graffiti, the oldest of which dates back to the 14th century. On the ground floor, a projection brings to life the atmosphere of the illuminated Retreat of 1889, a Auxerre night party that reached its peak.