Smithsonian Planter Collection from Campania International The Smithsonian Collection from Campania International is a beautiful, intricate group of garden urns, pedestals, fountains and more. The inspired cast stone garden planters and accessories are made to look like famous and timeless one of a kind pieces. Cast stone is a superior building material and will endure outside much better and more nicely than regular concrete. Thanks to its porous natures, cast stone will naturally age, creating a desired patina over time. Choose from twelve finishes to create a beautiful outdoor decor to enjoy for decades.