Add usable space to your yard. Here a troublesome slope was turned into a deck. The deck was carved into the hillside and surrounded by a retaining wall. Same principle to build nice size pool with deck area.
My Shed Plans - 12 amazing DIY sheds and greenhouses: how to create beautiful backyard offices, studios and garden rooms with reclaimed windows and other materials. - Now You Can Build ANY Shed In A Weekend Even If You've Zero Woodworking Experience!