 It still has remarkable vaults with the arms of the Bourbon-Vendôme family and a niche for oil lamps decorated with three masks.A guard room (end 15th century) is installed under this staircase in order to control movement in the underground galleries.On the final level, protected by a strong curtain wall (around 1200 - 15th century) with cannon embrasures (15th century), stands an imposing rectangular keep built in the 12th century.