The remains of the Castle can be visited
Stolpe Castle

In Angermünde-Stolpe in the Uckermark district of Brandenburg, the Stolpe Castle Ruin is located. Its most prominent feature is the “Grützpott” (Porridge Pot), a residential tower that, with an outer diameter of 18 meters, is one of the largest of its kind in Germany.
History+
Originally, a Slavic rampart dating back to the 7th/8th century stood on this site. Between 1170 and 1190, the Dukes of Pomerania had a fortified residential tower built. Around 1250, the southern Uckermark came into the possession of the Ascanians, and the castle became the seat of a Vogt for the Brandenburg margraves. The town of Stolpe received town rights in 1286. After changing ownership, including a pledge to the Archbishopric of Magdeburg and a return to Brandenburg, Margrave Ludwig II ceded the castle to Pomerania in 1355.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Roland Neubert, Halle (Saale)
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: 52.9806, 14.1159