I live in a small town, just north of Nashville, TN. Ridgetop, TN is over 800 feet above sea level on the edge of the Highland Rim. The house I live in sits on land that once was home to a hospital for tuberculosis patients. Near our home is a train track and the opening of the L&N Railroad tunnel that runs underneath our little town. In 1905 it was hailed as one of the longest self-supporting tunnels in the world. It is approximately 4700 feet long and 22 1/2 feet high. The tuberculosis patients who were transported by train got off at the depot (no longer there) near the tunnel entry, then they were brought by horse and buggy up, up, up the winding path to the hospital. Over the years, the path was covered by trees, grass, leaves, flowers, and general growth.
However, on the weekend of May 2, 2010, the rains washed a lot of this cover away, exposing the large slabs of rock that were underneath and the path became much clearer. It also became much more dangerous in spots because some of the pathway was "sunk", meaning there is a 4' x 4' x 6' sinkhole in part of the path. No worries, we just scooted around it last time we went exploring.