This fortress owes its name to Tignoso di Tintinnano, a local lord who had it built. All that remains of the original fortress is the huge tower. Although badly damaged by the passage of time, it was restored and the missing sections were replaced by brick. A huge pentagonal courtyard surrounded by ramparts can be seen inside the fortress, which provides splendid views over the surrounding Orcia Valley. The tower contains a water tank and an oven designed to withstand a siege!