https://nedgravet-trampoliner.dk/

No only bikes

I think you mean Danish

It’s a long story of course, but goes back to a wave of nationalism that arose after the 1864 wars against Prussia. The Danes often said “what is lost externally must be gained internally” and it lead to a break with Pan-Scandinavism so Danes really had nothing but flags and flagpoles left. And boy did they use them.

Pennants are a very common thing on summer cabins