Birds Nest - Qualicum Beach, Canada

Here, when the wind blows, your room gently rocks. The rope tethers are almost vertical, which lets the treetops move considerably while hardly moving the sphere at all. When you walk around, the movement may be a bit more jarring -- especially if the sphere (which can be adjusted) hangs 100 feet off the ground. To get in, you take a spiral stairway and short suspension bridge. The inside houses a double bed, couch, counter cupboards, sink, microwave and refrigerator. What if a branch breaks? No worries, say the owners. There are still two others which should (hopefully) prevent a fall.

Price: $135-$205. Sleeps 3.