Onelli is obviously a relay village that has developed along the road that passes through from north to south and that is joined diagonally by short side roads.

Along the main road there are numerous buildings with perfectly integrated homes and cowsheds. Access to the north, as in Sciedi, is controlled by a house-tower that rises on the right-hand side of the road. A second tower, of which only a few structures of the elevation remain, used to stand on the opposite side of the road.

The village has been tampered with very little, so that its dignified architecture remains without concentrating around any one particular building, so that the entire village is of considerable interest.