Forte di Sommo Alto is one of the best-preserved Austro-Hungarian fortifications built on the Folgaria plateau before the First World War. The fort sits at about 1,550 metres on the ridge above the village, commanding views across the plateau and down toward the Vallarsa. It was part of the Sperre Lavarone-Folgaria defence system, a chain of fortresses intended to prevent Italian forces from pushing north through Trentino.
The fort is open to visitors in summer and functions as a small military history museum. The preserved underground galleries, artillery emplacements, and living quarters give a vivid sense of how soldiers survived the harsh plateau winters during the 1915–18 campaigns. The site is reachable by a short walk from a parking area above the village.