Located in the far north of Sweden, Kent and Britta Lindvall’s “Treehotel” consists of several unique structures, including a bird’s nest, a disappearing mirrorcube, an elevated caravan, a gigantic dragonfly, and even a UFO. What draws visitors in is its mix of isolation and architecture, with each treehouse offering a different architect, without harming the trees it rests on. Continue reading for more cool treehouses you might not have seen before.