The Gate can be visited
Town Fortification Nördlingen-Deininger Gate

The Deininger Gate in Nördlingen is part of the city fortification that encloses the medieval old town. It has fully preserved and accessible battlements.
History+
The construction of the Nördlingen city wall, which includes the Deininger Gate, began in 1327 at the behest of Louis the Bavarian. It replaced an older defensive rampart, the course of which is still visible today along some old town streets. Between 1536 and 1613, alterations were made, including the redesign of four gates and two towers, as well as the construction of additional towers and bulwarks. During the Thirty Years' War, specifically in 1634, the fortification withstood a siege by imperial troops that preceded the Battle of Nördlingen.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Rudolf Henkel
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: 48.8518, 10.4942