The remains of dungeons, more commonly known shoulder Gallardon, which was built in the middle of the twelfth century, is 38.40 m high, the inner diameter is 9 m and the outer diameter of 18 m. The thickness of the walls at the base is 4.50 m.
Shoulder Gallardon served as home for the guards who were in the service of the Baron. it was also used as a watchtower to monitor the area of common dangers of invasion.
Previously, it seems that the dungeons tenth and eleventh centuries were rectangular and had blind spots making surveillance difficult.
This tower was built in millstones, mixed flint embedded in lime mortar, sand and crushed bricks forming block, very resistant hardening.
The wall thickness varies, with the height from 4.50 to 3 m.
This dungeon completed the general defense system of fortified castle and the feudal pregnant with five doors, walls, ditches and moats.
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