Unable to answer "What type of bollard is this?" for https://osm.org/node/10556475770 via StreetComplete 54.0:

Here are stairs

Attached photo(s):
https://westnordost.de/p/176809.jpg

Unable to answer "What kind of building is this?" for https://osm.org/way/116023927 via StreetComplete 54.0:

Here are 4 single houses (Reienhäuser)

Unable to answer "What kind of memorial is this?" for https://osm.org/node/336457124 via StreetComplete 54.1:

Apparently Shoah momorial. There is written "Gedenke, Vergiss nie", remember, never forget.

Attached photo(s):
https://westnordost.de/p/181104.jpg
https://westnordost.de/p/181105.jpg

Unable to answer "What type of bicycle barrier is this?" for https://osm.org/node/7975639881 via StreetComplete 53.3:

I remember it used to be here, but isn't anymore.

Attached photo(s):
https://westnordost.de/p/172354.jpg