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This over-the-top, reader-submitted swing set includes a penthouse play space for triplets. thisoldhouse.com
Design Your Own Garden Playhouses For Children: Playhouse On Side Yard Beach Style Landscape Sandbox Climbing Plyhouse Deck Removable Grates On Top Of The Box ~ aureasf.com Terrace
The swing is brilliant! Hoerr Schaudt Landscape Architects
Build a structure where the kids would never want to come in! Combo Playhouse, Covered Play Structure and Sand Pit/Outdoor Toy Storage. Swings could be added. Built by Cubby Kraft, photo features Sandalwood Lodge Cubby House. Link leads to 50+ playhouse/structure examples.