The Nairola Stone is located from Pissarottino di Brunate to Montepiatto di Torno. It appears as a large flat, subhorizontal table, 7.4 m long by 4 m wide and about 4.5 height, protruding from the mountain slope, consisting of a block of gland one from the Val Masino (Valtellina). In addition to some cup marks, there are other pre- or protohistoric engravings on the Boulder: one resembling a footprint and a gully that runs eave-like around the summative part of the Boulder.

Two different legends exist about this stone. The first, probably older, says that on the Nariola Stone stood the devil; opposite, on top of another boulder (now destroyed), a companion of his, and together they enjoyed playing ball, sending it back to each other. On the now-disappeared fountain, it seems that, as a reminder of this sinister game, a clear hemispherical footprint remained left by the bounce of the ball that escaped the less experienced devil's hand. The second version, decidedly Christian, that L.M. Gaffuri in the book " I Trovanti ", claims to have been born probably to exorcise the demonic part of the rock, instead it would justify the protruding position of the boulder with a miraculous intervention of the Virgin that would have kept him with his cloak in his descent; they built a hundred meters below a little chapel dedicated precisely to the Madonna, which you can also reach from the hamlet of Mezzovico in the municipality of Blevio.