Unable to answer "What kind of memorial is this?" – prins Oscar Bernadottes familjegrav (Grave) – https://osm.org/node/8944387168 via StreetComplete 59.3:

Familjegrav. Oklart hur den passar in bland olika monument.

Attached photo(s):
https://westnordost.de/p/250747.jpg
https://westnordost.de/p/250748.jpg