Belgravia House in London by Todhunter Earle. Even though this is a rooftop garden, the design show would be excellent for any long, narrow yard. Great way to break up the space by making different "zones"!
There was a super awesome pirate ship at a house near Snow College when I was there. I have wanted something similar ever since. Red Beards Revenge Pirate Ship Playhouse : Luxury Playhouses at PoshTots