The remains of the roman Watchtower can be visited
Ancient BuildingHillscheid
Roman Watchtower 1/68

The Upper Germanic-Rhaetian Limes, with a length of 550 km from Eining near Regensburg to Rheinbrohl on the Rhine, is the largest archaeological monument in Germany and has been recognized by UNESCO as a World Heritage Site.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Wachtposten_1_68_Hillscheid.jpg
This description is a machine translation of an excerpt from the linked Wikipedia article. The source text was written by its authors, the translation is by Mobile History; like the original it is licensed under CC BY-SA 4.0.
Location: 50.4161, 7.6889