Ruby Falls is hidden 1,120 feet (341m) inside Tennessee’s Lookout Mountain. This cascade of water tumbles 145 feet (44m) into a limestone cave, against the backdrop of music and illuminated by colorful lights. Guided tours take you on the underground walk to the falls and, if bright lights and music aren’t your thing, there are limited spots available on evening tours, where the walk and falls are lit only by lanterns.

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