Torre di Acquapuzza, Medieval tower near Via Romana Vecchia, Bassiano, Italy

Torre di Acquapuzza is a tower positioned on a rocky outcrop of Mount Acquapuzza above Bassiano. Its location offers views across the former Pontine marshlands extending toward the Mediterranean coast.

Built in the 12th century, it was designed to control the strategic Acquapuzza Pass and secure communications between Rome and southern territories. The structure served as a defensive point along an important trade route.

The name comes from sulfurous springs in the area that leave visible traces on the landscape. Visitors notice these natural features while exploring the grounds around the structure.

To reach the tower, follow Via Romana Vecchia through the Borgo Tufette district. The route is walkable, and the journey allows time to observe the surrounding landscape and terrain.

Recent studies by historians of the Pontine region place this tower and the Acquapuzza Pass in the landscape behind the Mona Lisa, as the Pontine hypothesis for Leonardo da Vinci's background. The claim rests on comparison of the painted crags and water with the site, not on a document by Leonardo himself.