The remains of the Castle can be visited
Sibetsburg Castle

The Sibetsburg was originally a pirate castle of Edo Wiemken on the North Sea coast in the area of what was then Rüstringen. The remains can be found in the Wilhelmshaven district of Siebethsburg (current spelling).
Origin as a Pirate Castle+
The castle was built as a chieftain's castle by Edo Wiemken as Edenburg in 1383 and renamed Sibetsburg in 1416 by his grandson Sibet Lubbenson. For a long time, it served as a hideout for the Vitalienbrüder and was secured with several ramparts and moats. It was located in the Rüstringen area in East Frisia on an arm of the sea, so that seagoing ships could dock directly nearby. The castle was conquered in 1433 as part of the Hanseatic League's great punitive expedition against the East Frisian chieftains and finally razed in 1435. The arm of the sea later silted up; today the site is kilometers inland, approximately in the middle of Wilhelmshaven.
Archaeologists from the Küstenmuseum carried out excavations from 1962 to 1964, during which foundations of a defensive tower and outbuildings were found.
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Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Sibetsburg,_oben.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: 53.5317, 8.1077