Fabe56
Unable to answer "What kind of building is this?" for https://osm.org/way/94474310 via StreetComplete 34.1:

Platform and seamark

Attached photo(s):
https://westnordost.de/p/60751.jpg
https://westnordost.de/p/60752.jpg
https://westnordost.de/p/60753.jpg
https://westnordost.de/p/60754.jpg