When I was a kid we went to a treehouse that looked just like that.
There was a thick rope suspended from a tree which hung down into the clearing next to it. We'd use a little rope to pull the end of the big rope up to the treehouse, untie the little rope & swing down into the clearing.
It was
completely terrifying, but so much fun. Of course, It was probably only 30 feet off the ground, but it seemed as high as the picture you posted.
Thanks for the super pic.
