Each tongue of the Order of the Knights Hospitaller had its own tower, each in his own style and the French tower being the tallest. Each tongue was responsible for the maintenance and defence of a specific portion of the fortress and responsible for manning it with sufficient numbers of knights and soldiers. There were seven gates leading to the inner part of the fortress. The Knights had placed above the gates and on the walls hundreds of painted coats of arms and carved reliefs. There remain now 249 separate designs : those of grand masters, castle commandants, countries, personal coats of arms of knights and religious figures.

The construction of the three-storied English tower was finished in 1413. One door opens to the north, to the inner part of the castle; The other door leads to the western rampart. One could only access this tower via a drawbridge. The western façade shows an antique carved relief of a lion. Because of this relief, the tower was also called "the Lion Tower". Above this lion, one can see the coat of arms of king Henry IV of England.
Fourteen cisterns for collecting rainwater were excavated in the rocks under the castle.
[Wikipedia]