"L'hôtel des insectes" (insect hotel) is more like a sign rather than a real building. Unsure about the classification for this one.

via StreetComplete 53.3

Attached photo(s):
https://westnordost.de/p/173457.jpg
https://westnordost.de/p/173458.jpg
https://westnordost.de/p/173459.jpg