Castra ad Montanesium Fortress is located in the southwest part of Montana on the Kaleto Hill, on the way to Ogosta Dam and near the dam wall. The site is still under investigation, but can be visited by the public. At the beginning of the walk in the ruins of the fortress can be seen a large basilica. The built tourist path passes along it and leads to the fortress walls, behind which there is another, smaller church.

During the Roman Empire there were built and maintained roads connecting Montana with the rest of the empire, as a result of which the city flourished. The town and the fortress were demolished in the 6th century by the Avars and the Slavs.

Although small in size, Castra ad Montanesium Fortress is an interesting object, given its ancient origin.