...or someone else could just post one, haha.
Also, both upper entrances to Mystery Falls are artificial. The "open air" entrance was blasted open, the same as the side entrance where the gate is now. The lower entrance was thru Anderson Spring, a small spring which emptied out into the Tennessee River and was the route by which it was originally discovered. The spring is no longer accessible because:
A) TVA's dam at Hales Bar rose the level of the Tennessee River and
B) Material was moved from the opposite side of the river (Moccasin Bend) to the Lookout Mountain side of the river to allow for the construction of I-24.