Perched on the extremity of Poggio al Pruno, just a few kilometers from Montecatini Val di Cecina, it is the highest relief in the area and overlooks the entire coastal plain from Follonica to Rosignano: the Castle of Sassa affords a panoramic view of the sea, from which much of the Tuscan Archipelago can be admired.
Sassa is mentioned as an unfortified settlement in a document from 1128, but as early as 1171 it appears in the written documentation that has come down to us as a castrum, castle, that is a town with fortifications.
The area of the Sterza valley where Sassa is located appears to have been inhabited since Etruscan times and subsequently occupied during the Roman and early and late medieval periods.
During the summer, the town comes alive with tourists who decide to enjoy the coolness offered by the hill; they are welcomed by shows and festivals that, especially in August, allow them to taste local dishes based on wild game.