Is thought to have been a pagan cultic center until Charlemagne abolished Saxon Paganism in 782 AD. It was then used by Christian hermits throughout the Middle Ages. (Contains a number of astronomical alignments).
Externsteine - on giving rock were built by the devil in one night
Externsteine, Sandstein-Felsformation in Horn-Bad Meinberg, Teutoburger Wald my website