Its territory is essentially extending over mountains, on the Apennines side, being Monte Sillara (1891mt) the highest peak. The village sits on top of a rocky promontory, surrounded by oaks, chestnuts and pine forests.

Bagnone gained its importance thanks to its strategic importance, at the crossing of several roads merging to the valley from mountain passes

Its origins are linked  along VI-VII centuries to the struggle between Byzantines and Longubards: at that time a defensive line was organized on bizantines’ side in order to protect Luni harbourand prevent invasions from the Appenines side. Filetto was part of this defensive line