Burg Walternienburg, Medieval castle in Zerbst, Germany

Burg Walternienburg is a small castle on the Nuthe in Walternienburg, part of Zerbst/Anhalt. Its medieval remains are the 30-metre-high bergfried, built in the 14th century with walls 3.5 metres thick and an interior of two by two metres, and probably parts of the ring wall. The former moat-and-rampart system is still clearly visible.

The site was first mentioned in documents from 973 when it was given to the Archbishopric of Magdeburg as part of a trade and honey tithe donation. The name addition 'Walter' appeared in 1359 and may be connected to Count Walter II of Arnstein-Barby who controlled the fortress.

The name Walternienburg first appears as "nigenburg" in 973; the prefix "Walter-" was added in 1359, possibly after Count Walter II of Arnstein-Barby. The counts of Arnstein-Barby served as bailiffs (Vögte) for the Quedlinburg abbey, which held the estate. The 30-metre keep, with 3.5-metre walls and a two-by-two-metre interior, is the main medieval structure a visitor can still see.

The castle area is freely accessible. The former moat and rampart system is still clearly visible in the terrain, and the 30-metre keep with its 3.5-metre-thick walls can be viewed from outside. The site lies on the Nuthe in Walternienburg, a district of Zerbst/Anhalt.

The keep built in the 14th century is 30 metres high, yet its interior measured only two by two metres, with walls 3.5 metres thick. The name addition "Walter-" first appears in 1359, possibly referring to Count Walter II of Arnstein-Barby.