Palazzo Corboli, adjacent to the church of Sant’Agostino, was the residence of the famous family of Baba, wealthy Sienese merchants who probably lived there since the end of the 200. In addition to the precious portion of the wall in pisé perfectly preserved (visible in Room 9), there are numerous traces of frescoes in the various halls. These include the room of the Four seasons and the Hall of Aristotle, which preserves large portions of splendid pictorial cycles attributed to the Sienese Christopher of Bindoccio and Meo of Pero.
On the main floor, on the ground level (destined to the seabed) and in part of the second floor is housed the collection of Sacred art, with works originating mainly from the churches scattered in the territory of Asciano. The setting has about thirty objects, in general high quality, some of which are true masterpieces. Among the works are remembered the wooden crucifix attributed to Giovanni Pisano, a delicate Madonna with the child of Mark of Bonaventura, one of Lipp and Frederick Memmi, the triptych of Rofeno by Ambrogio Lorenzetti, the Annunciation of Francesco di Valdambrino, and Pale di Matteo di Giovanni, Paolo di Giovanni Fei and Giovanni di Paolo. Among all the paintings stands out the Nativity of the Virgin of the Master of observance, among the absolute masterpieces of the fifteenth century Senese. The collection ends with more recent works, especially of the XVII and XVIII centuries, as well as on parades and liturgical outfits.
From the middle second floor the route introduces to the archaeological section. This, dedicated to the evidence of the high valley of the Ombrone, essentially collects the finds from the excavations of the necropolis of Poggio Pinci and the mound of Molinello (in Asciano), from the Necropolis of the knoll (in Castelnuovo Berardenga), and from the Roman Baths of Campo Muri (in Rapolano).
The collection is organized by exposing the exhibits by provenance, recreating also the original disposition of the objects in the Etruscan tombs and the Roman baths, as well as some departments, always Etruscan-Roman, found during the restoration work of the museum itself. Among the most prestigious pieces, the funeral kit of a princely burial of the necropolis of the knoll, or the rare examples of archaic stone sculpture from the mound of the Molinello (from VII to. I century B.C.), objects in Bucchero, urns in travertine and tuff, vases (including some rare kelebes Volterra).