The Hartenfels – Geology and History

A Jura landscape tells - Station 14: The Hartenfels, the 531m high mountain of Neukirchen, is a geologically as well as historically remarkable mountain massif in the east of the village. A mighty rock tower from Frankendolomit builds the summit of the Hartenfels (climbing garden). From the summit of the Hartenfels you have a beautiful view to the south and west over the Kuppenalblandschaft. On the slopes are pronounced Karsterscheinungen to find: u. a. on the southeast side the French hole (smaller, branched corridor and room system) and on the south side the Frauenfelshöhle (or Wind hole, a small floor cave). The rock is listed in the list of geotopes in the district of Amberg-Sulzbach under the geotope number 371R025.
On the rocky spur and the adjoining terrain there are clear traces of a medieval castle. The stable Hartenfels is the remnant of a high medieval Adelsburg, which once rose on an imposing rocky spur. The castle was probably built during the 13th century by the Lords of Neidstein, but there are no mentions of the castle itself. Only in a document dated 21st February 1268, it is indirectly named in the name of Heinrich von Hertenvel ( = Hartenfels).
de.wikipedia.org/wiki/Burgstall_Hartenfels