School’s out for summer, and kids are hitting the swings, seesaw and slide at parks all around the country. While there are plenty of generic playgrounds for kids to choose from, there are also a bunch of great eco-friendly playgrounds that are made from recycled materials that promote creativity while lessening their impact on the environment. From a playground made from an upcycled wind turbine to a playground made from thousands of recycled tires, check out 6 of the world’s top green playgrounds.