Treehouses are great places for kids to play with their friends. Although nowadays they become something more. A treehouse can become an additional living space, a guest house, a home office or just a private retreat in a backyard. Even luxury hotels and cafes can be found on trees. German company, Baumraum, is one of companies which specialize in such projects. Their portfolio consists of many different treehouses that can inspire everybody to build such cool thing in their backyard. Check out their best three house designs that we gathered for you.