The Biselli tunnel allows you to avoid a dangerous tunnel shared with cars. The setting is spooky and it's not well maintained, but it has so much charm.
Here we are immersed in the valley, next to the Tenna river - opposite, on the other side of the river, there is the entrance to a cave, known as "Buco del Frassino"
The Ambro Source is one of the naturalistic attractions of the Sibillini Mountains. It is a cave from which a stream flows and forms a waterfall. Here the Ambro river …