The remains of the Castle can be visited
Schwabsburg Castle

Schwabsburg Castle is the ruin of a castle at about 84 meters above sea level, U-shaped and surrounded by the district of Schwabsburg, part of the municipality of Nierstein in the Mainz-Bingen district in Rhineland-Palatinate.
Schwabsburg was probably founded around 1210 and was first mentioned in a document in 1257 in a royal charter by Richard of Cornwall as a stronghold of Staufer rule on the Rhine.
In the 14th century, the castle came into the possession of the Archbishop of Mainz as a pledge of the Empire for 60 years and thereafter became the property of the Electors of the Palatinate.
During the Thirty Years' War, the castle was destroyed by an army led by the Spanish field marshal and general Spinola and demolished in 1799 after its auction.
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Of the former castle complex, only the keep and parts of the curtain wall remain. The square keep has a side length of 9.5 meters and is about 22 meters high. The approximately 3.5 meter thick walls are clad with bossed ashlar. The original elevated entrance is at a height of about 10 meters. The shield wall on the west side of the keep had a thickness of 2.8 meters. Today, the keep is secured and accessible as an observation tower.
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Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=899&sid=246e8c9fdbfa80ccf9a3497b2adfd6ed
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: 49.8639, 8.3117