Sassoferrato is situated on the eastern side of the Apennines; it's a prosperous little town watched over by a solid citadel, built by  Cardinal Albornoz in 1365, and a medieval borgo high on a ridge above the modern sprawl.  It was the former Roman city of Sentinum: it was here that the Roman army defeated the combined Samnite and Gaul forces in 295 BC.
There's the  archaeological Sentinum area, with cobblestone streets, the cardo and the decumano, the remains of a thermal temple and the portico of a large building outside the walls of the city. The Archaeological Museum of Sassoferrato, housed in the Palazzo dei Priori, documents the different aspects of everyday life and society in the ancient Roman city of Sentinum. On the ground floor of the Palazzo dei Priori is the Perottiana Hall, boasting a valuable collection of Byzantine and Flemish reliquaries, including the icon of St. Demetrius. The Civic Art Collection includes twenty-six valuable paintings dating back to the fifteenth and the late eighteenth century. The main attractions are two paintings made by Giovan Battista Salvi (Sassoferrato 1609 - Rome 1685), the great painter universally known as Il Sassoferrato, whom is dedicated the International Prize of Contemporary Art Exhibition GB Salvi, that takes place in summer.
Must-see attractions are also the Museum of the Sulfur mine, located in Cabernardi, documenting the history of one of Europe's most important sulfur mines; the Museum of Art and Popular Traditions, housed in a former convent, where a typical local farmhouse is shown; the Collection "Engravers of the Marche", boasting over four graphics (including seventeen drawings), made by two hundred and ten artists from the Marche. Another remarkable tourist attraction is the Abbey of the Holy Cross, built in the late twelfth century by Counts Atti with stones from nearby Sentinum.