Nature Trail Climbing Wall Posted December 19, 2013 40 feet high This is Michigan’s only vertical nature trail! It’s mounted on the side of the 50-foot high Treetop Discovery Tower. As you climb the wall, read about the flora and fauna that is found in the forest at that level. Press the buttons on your way up and hear distinct bird calls. At the very top, hit the button to hear a hawk and signal that you’ve made it. A gentle glide down with the auto-belay system wraps up your Adventure Tour.