sentences:  The Calidarium, formed by a rectangular room from whose walls passed the warm air, was placed halfway between the Villa and "Cala Maestra" and was richly adorned with marbles and mosaic floor.The Romans built a small harbour and a wharf at "Cala Maestra" cutting the rock in order to have more space.The Villa was provided with a cistern to collect the rain water since the island is lack of springs; the water produced today by a desalination plant is collected in the same cistern.