The Monument can be visited
Kyffhäuser Monument (Barbarossa Monument)

In the Kyffhäuser Mountains in Thuringia, Germany, stands the Kyffhäuser Monument, also known as the Barbarossa Monument. It was erected in honor of Emperor Wilhelm I and combines German history with legendary tales.
History+
Following the death of Emperor Wilhelm I in 1888, numerous monuments were erected in his honor across the country. The Kyffhäuser Monument, designed by architect Bruno Schmitz, was constructed between 1890 and 1896 and inaugurated on June 16, 1896. It ranks among Germany's largest monuments and was initiated by the German Warriors' League, which later, as the Kyffhäuser League, also took over its administration. The monument's architecture is inspired by the Staufer-era castle construction and aims to symbolize the Prussian-dominated German Empire as the successor to the medieval Holy Roman Empire. It incorporates the Kyffhäuser legend, portraying Emperor Wilhelm I as the unifier of the empire, much like the sleeping Barbarossa who was destined to awaken.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Norbert Kaiser
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: 51.4129, 11.1089