The Town Fortification can be visited
Town FortificationAllendorf
Town Fortification Allendorf

The Historic Building: A Journey Through Time+
From Defensive Wall to Cultural Monument+
The city fortifications were erected in the 13th century and continuously expanded.
Originally conceived as a purely defensive structure, the building underwent numerous transformations over the centuries.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 51.2721, 9.9762