While walking in the wash behind Costco in Tucson I saw these structures,
I have no idea what they are and can’t find anything about them. But they’re well constructed.
My guess is some sort of bicycling training, BMX maybe, but that was a lot of effort to do and they didn’t look to have been used lately.

In my country they call that a bridge.
You don’t have the persepctive. It’s 6in or so wide and flat on the ground. Those trails of wood slats are a few hundred feet long and sometimes end in platforms that dangle over a cliff.
Whatever it is, is very odd.
Obviously, this is art.
Oops, I meant Art.
Kinda looks to me like some leprechauns were drunk , and decided to try and build a teeny tiny rollercoaster….but were interrupted. Or perhaps set upon by the anti-rollercoaster coalition.