Indian Trail Caverns This scenic ridge area lies along the edge of the old Great Black Swamp and Big Spring Indian Reservation, home to the Wyandot Indians. Access to the caverns is provided by gentle stairways which have been designed to accommodate both young and old. The Sheriden cave site, which is part of Indian Trail Caverns, is being researched by top specialists from around the world and has been filmed as part of a special on the Discovery Channel about the extinction of certain mammals at the time of the last ice age. Guided tours are available and is open Memorial Day weekend to Labor Day weekend with private tours available April - October. Cash only.