Tunnel Hill State Trail
The Tunnel Hill State Trail is a bicycle trail running from Eldorado to Karnak, Illinois. The trail runs along the former bed of a part of the Cairo and Vincennes Railroad. The Tunnel Hill State Trail offers bicyclists, hikers, walkers and runners with 50 miles of the most beautiful and peaceful miles in Illinois. The Trail stretches south from Harrisburg, through Vienna to Karnak, and includes a 2.5-mile spur through the Cache River State Nature Area.