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Review:
Hidden away inside Lookout Mountain, Ruby Falls is an extraordinary underground waterfall that wasn't discovered until 1928.
At an impressive 145 feet high, the cascade is the country's tallest underground waterfall open to the public, and it also happens to be the deepest.
Visitors have several tour options to choose from; the classic tour lasts approximately an hour and fifteen minutes, but there is also an extended tour for people who want more time at the waterfall.
If you're feeling daring, you can also take an evening tour with nothing but hand-held lanterns to light the way.
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