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The tower of Grimaldi has two doors and arrow windows or slits. It was accessed from the first floor by means of a ladder which was then removed. The ladder was used to go down to the ground floor through a trap door and also to access the upper floors. The ground floor was used as a warehouse for food supplies, and due to lightning damage, the corner stones at the top of the tower were in danger of collapsing. It was restored in 2018.