unique hotels in the world - Kids don't think twice about sleeping in a treehouse, but as adults, we forget how much fun it is. Revive that childhood magic at Sweden's remarkable Treehotel, which consists of seven living pods suspended in tall pines up to 20 feet above the forest floor. (You get into them via ladder, suspended bridge, or electric stairs.)

Choices include an abode that looks like a humongous bird's nest, one shaped like a UFO, and the reflective "Mirrorcube." Guests get enchanted views of the woods, the Lule River, and (at the right time of year) the aurora borealis. From September to March, the hotel's employees give guided northern lights tours; all year long, you can eat at the on-site restaurant, which specializes in northern Swedish cuisine, and explore the 600-person village of Harads.