The Santomasi Scacchi Museum houses some of the most important evidence of Gravina in Puglia's rich cultural heritage.

The first construction could date back to the twelfth century. In this phase it was equipped with a tower and a wall circuit of trapezoidal shape. During the fifteenth century it was totally rebuilt, enlarging the walls and providing it with three circular towers and embattled with a base shoe. The two surviving towers are characterized by battlements and hanging arches resting on stone shelves. This crowning continues also on the curtain wall. Each tower was equipped with loopholes and connected to the walkways with rooms for the guards and the housing of weapons.