On Monte San Giovanni to the north of the present town of Carlantino, an important archaeological area has been discovered. After careful excavations have come to light finds dating back to the prehistoric age that attest to the presence of a Roman settlement. Of great historical interest are the remains of walls and what seems to have been a furnace for the processing of iron. In this site were also found some finds, a collection of 300 coins and numerous acorns of lead, which seem to testify that the place was the scene of battles (perhaps between Romans and Carthaginians during the Second Punic War). The hill also preserves the remains of a medieval settlement: the Casale di San Giovanni Maggiore.