Final Union Line

Historical marker location:

Lookout Mountain, Tennessee

( Memorial is at the intersection of Shingle Road and Military road, on the left when traveling north on Shingle Road.)

Marker installed: 1890

The largest underground lake in the United States is located in Tennessee. The Lost Sea, located in Sweetwater, Tennessee, covers over four acres and is home to a variety of unusual creatures, including blind fish and crayfish.