Of the military power of the Lords of Beaugency only remains the high dungeon of 36 meters high, which is an impressing example of Romanesque architecture, similar to those of Loches or Langeais.
Its situation makes it a military place of choice to supervise the defense of the high city, the religious constructions built in the 12th century within this one, and within the bridge on the river Loire.
In the middle of the 15th century, Jean de Dunois turned the existing constructions into a new building which became his own dwelling: The Gothic main building is endowed with mullioned windows topped with a remarkable medieval frame with two-level galleries and, in overhanging, a chapel dedicated to Saint Georges from which one can enter the castle.
In the beginning of the 16th century, Jean’s grandson, Jean de Longueville had it rebuilt as well. From this period remains the Renaissance wing, the spiral staircase and the oratory decorated with frescoes …
The last modifications are brought in the 19th century, when the castle was used as a Deposit of Mendicity.