Local government
Burgmannensitz der Herren von Frankenstein

In Zwingenberg, Hesse, the Burgmannensitz of the Lords of Frankenstein, a structure that once served as a lowland castle, now houses the town hall. Its location at the northwestern end of the northern city wall was important for the protection of the region and the customs routes.
History+
The origins of the Burgmannensitz date back to before 1500, when a Burgmannenhaus owned by the Lords of Frankenstein likely stood on this site. Around 1520, Eberhard von Bischofsrode, who was bailiff of Auerberg from 1500 to 1516 and chief bailiff of the Upper County of Katzenelnbogen in 1534, is presumed to be the builder of the small castle. The first documented mention of the castle seat occurred in 1603, when Bischofsrode's heirs sold the property to Arnold Schwarz. After several changes of ownership, including Bernhard Schaffalitzky von Muckadell (1688–1700) and Carl Ludwig von Felsen (1701–1707), the small castle came into the possession of Johann Christoph Mohr, Edler von Mohrenfeldt, in 1712.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=984
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: 49.7237, 8.6129