The town - on a short ridge in a landscape where meadows, coppices, and chestnut woods alternate - has a quadrangular tower, the remains of an 11th century castle. The tower dominates the wooded valley of the Archiano torrent, which descends from the Passo dei Mandrioli to Bibbiena. The origin of Serravalle is to be found in its dominant position and its proximity to the crossroads of the roads leading to Badia Prataglia and Camaldoli. The old castle was to serve as a sentry. In 1305 Serravalle was further fortified and equipped with a keep and tower.