Monte Acero, Mountain peak in Telesina Valley, Italy.

Monte Acero is an isolated relief in the Telesina Valley, shared by the municipalities of San Salvatore Telesino and Faicchio, near the Monaco di Gioia peaks that branch off from the Matese. Its summit is ringed by about three kilometres of dry-laid megalithic walls of large squared blocks, on average 3.5 metres high, with two original openings, one facing south toward Telesia and one to the north.

The mountain was fortified by the Samnites in the 6th century BC with stone walls that served as a lookout point. This ancient structure shows how strategically important this site was for the region's early inhabitants.

A cast-iron statue of Christ the Redeemer stands on the eastern peak and was placed there in the early 1900s. It has become a visual marker that visitors immediately notice when approaching the summit.

Walking trails lead to the summit with multiple routes suited to different fitness levels and hiking experience. Weather can change quickly at this elevation, so bring proper footwear and weather protection.

The walls average 3.5 metres in height, and the best-preserved stretch runs along the southern side of the mountain, away from the paths. Two original openings remain: one facing south toward Telesia, the other facing north. The rectangular blocks are packed with rubble in the gaps between them.