In 1974, this reconstruction of a watchtower was erected approximately at the original position (originally, watchtower 1/1 was located about 70 metres further south). It gives an impression of the appearance and functionality of the Roman Limes watchtowers at the Upper Germanic-Raetian Limes at that time. The Limes secured the land border between the Rhine and the Danube over a distance of 550 km, separating the Roman provinces of Upper Germania and Raetia from free Germania. A total of 900 guard posts (towers), numerous forts and over 60 large forts were built along this route.