Trontano is situated at the entrance of  Val Vigezzo, over a wide glacial terrace raised above the plain of the Toce. Just a few minutes from Domodossola with the Railway of the Vigezzina, it has maintained the character of the rural community.

The tower of Creggio: signal building damaged in the 15th century and then restored by the will of Ludovico il Moro after the battle of Crevola (in 1487),  visible downhill of the village going up along the railroad. Traditionally, the tower has been given a reputation of being the refuge of Fra Dolcino in the XIIIth Century, who was an heretic who died burnt on the stake in Valsesia.

The Parish Church of Santa Maria: the Romanesque façade is richly decorated with geometric, plant designs or cruciform. The nearby bell tower, is likely to be a transformation of a previous watchtower.

Shortly after the village of Trontano, heading towards Verigo along the old path that went up in Val Vigezzo, you reach the stone bridge over the Rio Graglia river. This area is called “I Mulìt” for there is 6 small stone mills, aligned in series along the water course, used in the past for the milling of the cereals, especially rye. The buildings date back probably to the end of the 16th beginning of 17th Centuries but almost certainly were built on the remains of pre-existing mills. The Graglia mills lived their last season in the difficult years of World War II, then began the abandonment and decay. A recovery project has allowed to restore the buildings, the mechanisms of milling, the channel for the water, the bridge and the votive chapels.

A series of informative panels lead to the discovery of the mills, their functioning and the history of milling of cereals.