Five futuristic tree houses, from the Bird’s Nest to a full-size UFO, were built with minimal impact on the Lule River Valley. The newest tree room, Mirrorcube, has reflective glass walls that disappear into the pines. After a meal of local elk or reindeer, visit the treetop sauna until it’s time for a midnight fishing trip or a mountain-bike ride. From $453. 46/(0) 928-104-03, treehotel.se

Photo courtesy of Treehotel. This appeared in the July/August 2012 issue.