These things are ubiquitous in Berlin: https://stage.berliner-seilfabrik.com/wp-content/uploads/201... They're not actually that high to an adult, but I have childhood memories of these seeming somewhat tall and scary. On an average one, a young child can fall 4-6 times their own height (but not straight, you'll get buffered by the structure as you go down).
We've got these in many newer playgrounds in Canada. They're awesome and always full of kids.
I wish we had stuff like that when I was a kid.