The town is on two levels, the Borgo district and the Castello district, dominated by the remains of the Albornoz Fortress built in 1365. In the territory of Sassoferrato there is the ancient Roman city of Sentinum, theatre of the famous Battle of Nations (295 BC), which saw the victory of the Romans over the Gauls and Samnites. The paved streets, the cardo and decumanus, the remains of a thermal temple and the quadri-portico of a large building are visible in the archaeological area. Near Sassoferrato stands the Abbey of Santa Croce, built in the late 12th century by the Counts Atti with materials from nearby Sentinum. To the painter Giovan Battista Salvi (Sassoferrato 1609 - Rome 1685), protagonist of European classicism and universally known as Il Sassoferrato, is dedicated the Rassegna Premio internazionale d'arte contemporanea G. B. Salvi (G. B. Salvi International Contemporary Art Prize), which takes place during the summer. In the hamlet of Cabernardi you can visit the "Sulphur Mine Museum", which illustrates the history of the most important sulphur mining site in Europe.