Treehouses come in all shapes and sizes. Some are regal and British. Some are covered in micro-cabins. Others still might actually be submarines held up by chopsticks. This one, a severely rustic, multi-tree affair connected by ship-rope bridges and adorably embellished with glittering fairy lights, was built by Peter Bahouth, executive director of the U.S. Climate Action Network, in a wooded lot next to his Atlanta home, and is bookable for $275 an evening.