USA_9600
This is the United States tallest and deepest underground waterfalls about 145-foot. Discovered accidentally in 1928 within the Lookout Mountain in Chattanooga, Tennessee, today Ruby Falls today attracts over half a million visitors each year.
The stream is fed by both rainwater and natural springs. It collects in a pool in the cave floor and then continues through the mountains until finally joining the Tennessee River.
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