Treetop Discovery tower Posted December 19, 2013 Set on the park’s eastern bluff, the 50’ Treetop Discovery Tower is a hub for natural history learning. At the top of the tower, learn about the amazing recovery of the American Bald Eagle. The tower offers a spectacular view of the Straits of Mackinac, the Mackinac Bridge, and Mackinac Island. Look closely on a clear day, and you can even see Fort Mackinac from here! The Nature Trail Climbing Wall is mounted on the side of this tower.