Heidenmauer (Palatinate) — Wikipedia

The Heidenmauer ("heathen wall") near the Palatine county town of Bad Dürkheim in the German state of Rhineland-Palatinate is a circular rampart or ringwork, two and a half kilometres long, which was built by the Celts around 500 B. C. as a type of Murus Gallicus but was pulled down again not long afterwards. The wooden elements of the wall have disappeared over the course of time by rotting away, but the stones have survived. The Heidenmauer is a cultural monument according to the protected monument act of Rhineland-Palatinate.