This is a 500-foot boardwalk and observation deck that provides accessibility to guests with disabilities. You may ride the chairlift, when operable, to the mouth of the tunnel.
Natural Tunnel State Park is in Scott County, about 13 miles north of Gate City and 20 miles north of Kingsport, Tenn.. To get there, from I-81, take U.S. 23 North to Gate City (about 20 miles). The turn-off to the park is at mile marker 17.4 on Rt. 23. Take Natural Tunnel Parkway about one mile east to park entrance.
http://www.tripleblaze.com/trail.php?c=3&i=2828