The “Devil’s Wall” of Crodo, an imposing wall 20 m long, 6.5 m wide and 13 m deep, is made of large blocks of stone bounding a wide terrace on three sides, forming a rectangular area oriented according to the points of the compass.

Its intriguing name barely hints at the many legends attached to this fascinating place, which has not yet been accurately dated, though archaeological finds from prehistoric, proto-historic and Roman times suggest it is very ancient. The “Devil’s Wall” was probably used as a place where sacred celebrations and religious rituals were performed. The same area presents other interesting historical-archaeological features, such as some “balme”, or rock shelters, and several cup marks, small round depressions carved into the rock, sometimes connected by channels or “gutters”, which are still the object of study. Their significance is still unclear, though many interpretations link them to ancient religious cults. 

However, the Ossola area as a whole has various interesting megalithic structures, including those of Castelluccio and Croppole near Montecrestese.