I really like this elegant sandbox/labyrinth arrangement in a corner of Amsterdam’s Vondelpark (spotted during a recent 24-hour stopover in the city).
I think the hedges are hornbeam supported from within by wires and posts.
There’s a brief history of the sandbox here, in the blog Playscapes.
Click on ‘Continue reading’ below to scroll through larger versions of the photos.
enclos*ure 
I love this park, and had paid few visits. Good images!
Ah, this is nice!
Hedges and bikes: very Dutch!
Dear all, thanks for the comments! Amsterdam has such nice outdoor spaces.