The Gate can be visited
Town Fortification Dülmen-Lüdinghauser Gate

The Lüdinghauser Tor in Dülmen is a remnant of the town fortifications. It stands at the edge of the city center and marks the path towards Lüdinghausen.
History+
The origins of the Lüdinghauser Tor date back to the 14th century, when it was a wooden gate forming part of Dülmen's town fortifications. By the end of the 15th century, stone towers were added, initially connected by a wooden battlement. From 1584, cannons were stationed at the gate. The battlement and an intervening gatehouse disappeared. The gatekeeper's house was demolished in 1836 after the collection of road tolls was prohibited. Until 1906, one of the towers also served as the town prison. Although the towers were considered a traffic obstruction in the mid-19th century, the government forbade their demolition. Instead, pedestrian passages were broken into the towers.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=563
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: 51.8283, 7.2801