Coasters can do more than keep your favorite table watermark-free - they can drop knowledge. This set of four coasters represent the actual topography of five iconic American landscapes: the Red River Gorge, Death Valley, Big Sur, the Grand Canyon, and Mount Washington. They're made from renewable and highly absorbent cork, which has been layered to build each design. The backs are covered in plywood engraved with the geographical coordinates for the spot depicted on its front. And you thought coasters just sat there.