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In Roman times a road coming from the Roman military fort at Gnotzheim and leading into German territory crossed the Limes at Unterwurmbach. Here, a passageway through the Limes palisade (ca. 160 A.D.) as well as the Raetian Wall (ca. 200 A.D.) is documented.
When the Raetian Wall was built, it was attached to an already existing watchtower (4,2 x 3,7 m) 31 m west of the road. Unterwurmbach is one of several examples of passageways across the Limes, often to be found at intersections with important pre-Roman trade routes.
Thus the Limes was not an impenetrable barrier between the Roman empire and its neighbours but instead allowed the channeling and controlling of traffic as well as the taxation of humans and goods.
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