Here is a bird watching tower.

via StreetComplete 58.2

Attached photo(s):
https://westnordost.de/p/225270.jpg
https://westnordost.de/p/225271.jpg
https://westnordost.de/p/225272.jpg
https://westnordost.de/p/225273.jpg
https://westnordost.de/p/225274.jpg