This is the most obvious architectural work, keep the defense system. a mansion built in the second half of the thirteenth century by the will of the bishop Enrico da Fucecchio, became a military fort after several renovations took place during the Florentine domination and the Genoese, in the fifteenth and sixteenth centuries. Fell into disuse, was gradually demolished to reuse the materials elsewhere, in particular for the construction of houses; the last time I was given permission to take constructive material was, in the nineteenth century., for the construction of the choir of the Church of Santa Maria Maddalena. The imposing structure, even more enhanced by the nakedness of the stone walls, are the great crenellated tower, with the crowning of corbels of sandstone fruit of refined Florentine restructuring of 1468, and the smaller circular tower fitted instead of corbels in brick. The latter, built by the Genoese, he was used as Santa Barbara and also allowed control to the door of access to Vallecchia village, thanks to loopholes that allowed the grazing artillery fire. The building consisted of two buildings, which housed several outlets: state rooms, accommodation for the troops, wineries but also a rich chapel, a spacious courtyard and a mill. On the area once occupied by the bulk of the fortress, it is currently developing the eighteenth-century Querciola Square.