Author 'Lumixane' (Id 160506 ) : If you take the coastal path between the Palace and the Great Sand beach, you will find the way this amazing tank that I took through the grid. It said: "Building houses a vaulted cistern built by order of Vauban in the late 17th century. His 800 000 liters ensured the supply of fresh water warships docked boats including the foot of the cliff.".