Unable to answer "What kind of memorial is this?" – Memorial – https://osm.org/node/12320282257 via StreetComplete_ee 59.2:

Siehe Fotos

Attached photo(s):
https://westnordost.de/p/250106.jpg
https://westnordost.de/p/250107.jpg
https://westnordost.de/p/250108.jpg
https://westnordost.de/p/250109.jpg