The route goes through the Cumberland and Powell Mountains, and goes by Natural Tunnel State Park near Duffield.
12.
Tunnel # 1, a short distance from Kendall, is surrounded by natural tunnels formed by the surrounding canopy of trees.
13.
It is also possible to visit this natural tunnel although it is necessary to get to the entrance by vehicle.
14.
The D119 road runs right through the large cave, which is a natural tunnel 420 metres long and 50 metres high.
15.
The town is situated at the southern edge of the Jefferson National Forest and approximately two miles west of Natural Tunnel State Park.
16.
Natural Tunnel, called the " Eighth Wonder of the World " by William Jennings Bryan, has been attracting sightseers for more than 100 years.
17.
Humidity in the cave is perfect for propagating the clavaria formosa, and a natural tunnel in the cave connects to a basement of the castle.
18.
The slope's bottom layer was made of weak granite, Dr Hencher said, and a natural tunnel carried rain water inside the slope, weakening it further.
19.
Where Gal Oya falls to the reservoir, water flows in a natural tunnel known as Makara Kata ( Sinhalese for dragon's mouth ) or simply Makara.
20.
Surrounded mostly by Jefferson National Forest, it is down stream from the head waters of Stock Creek, which flows though Natural Tunnel and eventually into the Clinch River.
