Walholla Playgrounds are located in several places around the world but they first gained fame in Purmerend, Netherlands. The playground was created by the Dutch engineering company Carve. They were originally commissioned by the Purmerend City Council to create a climbing play space for schoolchildren. However, the stipulation was that they still needed enough room for a large soccer field. The imaginative company got creative and the results were out-of-this-world. The result is this structure which includes multiple climbing platforms between a mesh overlay. The space is only four-foot wide but can hold up to sixty kids at once. The results were so popular they can now be found in the American cities of Washington, D.C. and Boston.