[Answer] Where is America’s tallest publicly accessible underground waterfall?

 1 : Introduction to the question “Where is America’s tallest publicly accessible underground waterfall?
…Hidden deep within Lookout Mountain in Tennessee’s Cumberland Plateau is Ruby Falls — America’s largest and deepest publicly accessible waterfall. The 145-foot-tall falls are located more than 1,100 feet below the mountain’s surface. Tours operate daily via a glass elevator that descends 260 foot into the cavern, with colored lights illuminating the falls.
Where is America’s tallest publicly accessible underground waterfall?

Tennessee:

Where is America’s tallest publicly accessible underground waterfall?

The Correct Answer is

Tennessee:

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