Sassoforte Castle is located on the massif with the same name and it dominates the village of Sassofortino from above to the North-West.
The castle dates back to the Middle-Age when it belonged to the Aldobrandeschi family who kept it until the first decade of IV century. Hence the building was ruled by the city of Siena, which eventually turned it into a village.
In the V Century the castle collapsed, and many ruins are still currently visible to remind us of the importance of the site during ancient times.