Ruby Falls is 1,120 feet below the surface and is surrounded by smaller caves and myriad stalactites and stalagmites.
To reach a prime viewing spot, a glass-front elevator was built.
A one-way trip down this high-speed elevator takes half a minute, traveling at a speed of 600 ft/min.
So, how was Ruby Falls discovered?
During the process, a team member drilled into an 18-inch opening that led to a previously unknown cave.
Marveled by the sight, Lambert named the waterfall and cave after his wife, Ruby.
Given the intricacies of the location, all tours are guided.