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Ewa Kudlaty Yes, it's an observation tower. The picture shows only part of this. It's 25 meters height.
You can find more photos in internet. Here part from wikipedia description: "Marsk Tower ("Marsh Tower" in English) is a double helix-shaped corten steel observation tower designed by the Bjarke Ingels"

jazzie Oh, Bjarke Ingels, of course 😅 It seems hard to stumble upon nice architecture in denmark without reading his name somewhere, even though they have so many great architects!