The Tower of Palestro was part of a medieval castrum, which has now disappeared due to devastation in the 17th and 18th centuries. The Tower is the only survivor of the original complex, which according to historical documents included at least six towers, the residence of the feudal lords, civil and military buildings, prisons and a place of worship. Strategically located near the river Sesia, along the road between Vercelli and Novara and on the Via Francigena, the castrum allowed effective control of the territory. This tower was probably built at the beginning of the Visconti rule on Lombard soil, in the 12th century, which is why it is often called “Torre dei Visconti”. Its structure has a square plan and is externally decorated with red brick walls, crowned by Ghibelline merlons resting on decorative hanging arches. The tower is equipped with a working civic clock and a bell, believed by popular belief to protect against adverse weather events