[Answer] Where is the tallest and deepest publicly accessible underground waterfall in the U.S.?

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...1. Tennessee 2. Arizona 3. Arkansas 4. Texas

Step 2 : Answer to the question "Where is the tallest and deepest publicly accessible underground waterfall in the U.S.?"

Tennessee - Hidden deep within the 2,388-foot-tall Lookout Mountain in Tennessee’s Cumberland Plateau is Ruby Falls — America’s largest and deepest publicly accessible waterfall. More than 1,100 feet below the mountain’s surface, the 145-foot falls are part of a watershed that includes streams, snowmelt, rainfall, and irrigation runoff, so water flow varies dramatically throughout the year. Tours operate daily via a glass elevator that descends 260 foot into the cavern, with colored lights illuminating the falls. If you visit, don’t miss what’s above ground, either: From the summit of Lookout Mountain, you can see seven states at once: Tennessee, Georgia, Alabama, North Carolina, South Carolina, Kentucky, and Virginia.:

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