Ruby Falls is a 44 meter (145 ft.) high underground waterfall located about 341 meters (1120 ft.) below the top of Lookout Mountain, near Rock City and Chattanooga, Tennessee, USA. This surprising waterfall comes from the roof inside a cave, is collected in a pool in the cave floor and then continues through the mountain until finally join the Tennessee River. Electric lights were installed in the cave to turn it attractive colored.
