The Tower of Castionetto in Castionetto di Chiuro belonged to the Quadrio family and dates back to an age between Twelfth and Fifteent century. 
The tower was built in a dominant position and served the purpose of controlling the surrounding territories. The building is made of huge stone blocks, it has a quadrangular plant and its walls are so thick - more than 2.5 m at the base - that can contain a vaulted staircase linking the floors.
The tower is not preserved in its full height and we do not know whether the second floor had a barrel vault just like the lower floors.
The main portal is very well preserved and, for security reasons, it was located at a height of 3 m above ground. Two slits above the door and other details suggest that it featured a drawbridge.
A door at ground level was made later in time and it led to a room probably used as a deposit, which was previously accessibile through a trapdoor.