Over 10 million visitors have explored Ausable Chasm, the oldest natural attraction in the USA (est. 1870)! The amazing sights of the chasm will take your breath away. Enjoy walking along our towering cliff walks in the midst of a primeval forest that peers into the chasm from many scenic overlooks and vistas. Descend 150 feet into the depths of the chasm to walk the natural stone walkways of our famous Inner Sanctum trail that has amazed guests for 139 years! Sturdy walkways, bridges and stairs make this adventure possible - a unique experience that is not to be missed! While inside the chasm, ride the legendary Ausable River with your family in a river raft or choose an inner tube for a one-of-a-kind adventure.