The remains of the Castle can be visited
Tilleda Castle

The Royal Palace of Tilleda, a medieval castle complex, is located in Tilleda, a district of Kelbra in the Mansfeld-Südharz district of Saxony-Anhalt. It is the only fully excavated palace in Germany.
History+
The settlement of Pfingstberg, where the palace was built, dates back to prehistoric and early historical times, with use in the late Bronze Age. Early medieval traces around 700 indicate inhabitants. The first documented mention of the site occurred in the early 9th century in the “Breviarium Lulli”. In 972, Tilleda was referred to as an “imperial court” in the marriage certificate of Empress Theophanu and assigned to her as a widow's estate. Between 974 and 1042, “Tullide” served as a place for the issuance of documents by emperors such as Otto II, Otto III, Conrad II, and Henry III. During the Salian period, the main castle underwent renovations. In the 11th century, the palace lost its military importance and was replaced by the new castles on the Kyffhäuser.
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: 51.4169, 11.1361