Love the idea of building this into our natural hill. * I have an idea of making a hill (with part of it dug out like this picture) and have logs buried in it with about wide exposed to act as a natural rock wall.
Enchanted Woods - Winterthur Museum, Garden and Library in Delaware. there's a huge beautiful garden, and a whole enchanted woods with little wooden faerie houses and messages from the fae snuck in places.
Natural Playgrounds Company built a slide into a constructed hill at an elementary school as shown here in Glens Falls, N. The embankment slide is safer than tower slides with ladders. Scattered boulders, random dirt steps, rough terrain and varied plan