The Chatelet

The Chatelet (dungeon) was built in front of the north external front of Belle-Chaise, on which it leans without joining, leaving between this front and the south one an empty space, a large machicolation protecting the northen door, which has become the second inward door since the Chatelet has been constructed

The Guard Room

After penetrating into the Barbican which protects the first gate and entering the Abbey by the fortified staircase under the Ghâtelet — an important point which we shall describe later on — we come to the Guard Room.