Unable to answer "What kind of memorial is this?" – Glockenstuhl (Memorial) – https://osm.org/node/3833138487 via StreetComplete 58.2:

a.d. 1951 / EHRE SEI GOTT IN DER HÖHE!

Attached photo(s):
https://westnordost.de/p/228284.jpg
https://westnordost.de/p/228285.jpg