Bill Compher’s Cedar Creek Treehouse clings to a 200-year-old tree growing through the floor and out the roof. Built in the early 1980s, the treehouse offers spectacular views of its natural surroundings. Climbing the aptly-named, 82-foot-tall Stairway to Heaven to reach the observatory should be enough to induce sweaty palms, but if not there’s also a swinging 43 foot-long suspension bridge to negotiate once you’ve wound your way to the top of the spiral staircase. Thrilling? That’s one way of putting it.