The Tower can be visited
Town Fortification Magdeburg-Lukasklause

In Magdeburg, Saxony-Anhalt, Germany, stands the Lukasklause, a late Gothic defensive tower that was once part of the city's defenses.
History+
The tower's origins date back to the Middle Ages. As early as 1236, land was donated for the completion of the city wall in northeastern Magdeburg, potentially involving the site of today's Lukasklause or adjacent areas. The defensive tower, which secured the northeastern corner of the city wall, likely emerged between 1205 and 1232 or shortly thereafter. An initial mention of the tower as the “Welscher Turm” is dated to 1279 in historical city literature, although there are also indications of a mention in 1440. The tower's military significance led to numerous modernizations, including the installation of embrasures around 1450 and its expansion into the “Neues Werk” sconce in 1536. During the siege of Magdeburg in 1550/51, the complex proved its worth, but in 1631, despite further expansions, Pappenheim's troops broke through and partially destroyed the tower.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Lukasklause.jpg
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: 52.1361, 11.6508