Rocca di Urbisaglia, Renaissance fortress in Urbisaglia, Italy.

Rocca di Urbisaglia is a 16th-century fortification with a trapezoidal plan, four round corner towers, a gate tower and a keep. Its scarped walls were built for gunpowder defence, and the keep, now 24 m high with Ghibelline merlons, was entered by a removable wooden ladder. A cistern collected rainwater for the garrison.

Pope Alexander VI granted Tolentino permission to rebuild the fortress after the 1497 revolt, and the work was entrusted to Lombard masons led by Magister Antonius. It was finished by 1507, when a garrison of 12 soldiers was sent. In 1569 Pius V ended Tolentino's rule, and in 1877 the town council voted to demolish the Rocca; the Regia Sovrintendenza stopped the work.

The name distinguishes two elements: the castello was the walled borgo, now the historic centre, while the rocca was the fortress guarding it. Two medieval gates survive, Porta Entogge (now Porta Trento) and Porta Fiastra (now Porta Piave), both with pointed arches. The keep's Ghibelline merlons and the East Tower's gable roof, unusual for the other towers, are details to look for.

You can move through multiple levels including the towers and internal spaces, though narrow passages and stone stairs require careful footing and attention. Wear sturdy shoes and consider bringing a light source to better see details in darker chamber areas.

The base of the South Tower exposes Roman archaeological materials from the ancient settlement of Urbs Salvia buried beneath later construction. These visible layers reveal how a classical city gradually transformed into a military stronghold over time.