The Basilica dell'Osservanza is located about 2 km and half outside of the city gates, on a hill from where a beautiful view of Siena can be enjoyed. The Church has single nave with eight open chapels, a presbitery and a dome.

Inside are many works such as two statues of the Annunciation, a glazed terracotta altarpiece by Andrea della Robbia, The Pietą, a 16th century terracotta by Govanni di Paolo, Madonna and Saints, an altarpiece by Maestro dell'Osservanza(1454), St. Bernardine's portrait by Pietro di Giovanni(1439).

Next is a small museum with tresured chorals,Jewelry and a valuable wooden sculpture of "Mutilated Head of Christ carved by Lando di Pietro in 1337