Built in the 13th century in Gothic style and dedicated to the saint from Chiusdino, today it is completely in ruins: only the walls remain standing, with the apse still in evidence, perfectly facing east, while on the upper part of the facade there are two pointed windows. The roof of the Abbey of San Galgano is no longer there today. The "official" version says that it deteriorated and then fell over the centuries, while an alternative version, according to some legend and according to others truth, states that it was originally made of lead, and was sold by Girolamo Vitelli in 1550. Whatever the truth behind the roof of the abbey, after some restoration attempts that went badly, at the end of the 18th century it was deconsecrated and left to the elements until the present day. The ruins of the Abbey of San Galgano, with its profile still intact and immersed in the Tuscan countryside, offer a truly incredible and particular view. In addition to the roof, the floor is also missing, which during the summer turns into a grassy blanket, while you can still see a transept with three naves and 4 chapels with cross vaults. Next to the Abbey of San Galgano there is the cloister, which was rebuilt at the beginning of the last century, using the original materials. Some accessory rooms are also very beautiful, which can also be visited with the entrance ticket to the abbey, including the chapter house, where the monks originally met to deliberate the main rules of the community, and the scriptorium, which was the place where the monks copied the manuscripts.