This is one of the true highlights of the region. This 13 kilometre, slightly crazy, ultra high stretch of old military road is always closed to traffic. It starts exactly at Colle dell’Assietta (2472m) climbs past Forte Gran Serin and heads higher to just under 2800 metres, before descending through fantastic hairpins/mountains to the main road just below Colle delle Finestre. The best.