Summit of the Combe. Reachable on foot, can be visited on request to landowners.
At the end of the 16th century, the ancient Segusine urban fortifications were completely inadequate to support a siege and, furthermore, the possibility of their adaptation was rendered useless by the nature of the site, dominated by the surrounding heights.
For this reason a new fortified structure was set up in 1590 on the rise of the Combe, in a dominant position of the inhabited area and of control of the Moncenisio road on the opposite bank of the Dora, by the Milanese engineer Gabrio Busca.
The main front was composed of two half bastions, defended by a moat, between which the main door opened and defended by a raveline. The inside square, behind a second front, housed the buildings for the service of the fortress: the government, warehouses, neighborhoods. Despite the positive testing during the attack of Lesdiguières in 1593, the defensive capacity of the work was strongly limited by the domination exercised by the height of Brunetta, as seen, for example, in the sieges of 1690 and 1704.
With the construction of the Brunetta fort, starting from 1709, the old sixteenth-century fort has been integrated into the new plant, with which it will eventually be demolished following the Paris treaty clauses of 1796, at the end of the Alps war.
