The medieval fortress of Urbisaglia was a military fortification erected by the town of Tolentino at the beginning of the 16th century. It has a trapezoidal shape with the longest side facing away from the town in order to better face potential attacks. There are four corner towers, a gate tower and a keep where the garrison Tolentino had imposed on Urbisaglia resided. Indeed, the fortress' main function, other than to control the surrounding areas, was to guard the town and to prevent any rebellious acts from the citizens of Urbisaglia, who resented Tolentino's power over them.