An Unconventional Plan Takes Shape
In 1928, excavation began on an elevator shaft to descend 420 feet through solid limestone into the heart of a mountain to access Lookout Mountain Cave.
It was the first elevator in the world to descend . . . — — Map (db m292530) HM
Ruby Falls Fallout Shelter
Ruby Falls cave took on an unusual role in the early 1960s, becoming a designated Civil Defense fallout shelter.
Food, water, and medical supplies to sustain 720 people for several weeks were stored in the . . . — — Map (db m292536) HM