Ruby Falls is a series of underground cascading waterfalls totaling 145 feet (44 m) in Lookout Mountain, near Chattanooga, Tennessee, in the United States.

Ruby Falls Cave, unlike Lookout Mountain Cave, had no natural openings and could not be entered until the 20th century; it therefore does not have the various artifacts which are often associated with caves in the southeastern United States. In 1905 the natural entrance to Lookout Mountain Cave was closed during the construction of a railway tunnel. In the 1920s a chemist and cave enthusiast named Leo Lambert thought that he could re-open the cave as a tourist attraction, and formed a company to do so. He planned to make an opening farther up the mountain than the original opening and transport tourists to the cave via an elevator. For this purpose, his company purchased land on the side of Lookout Mountain above Lookout Mountain Cave and in 1928 began to drill through the limestone. In doing so, they discovered a small passageway about 18 inches high and four feet wide. Exploring this opening, Lambert discovered the formerly hidden Ruby Falls Cave and its waterfall. On his next trip to visit the cave, Lambert took his wife Ruby, and told her that he would name the falls after her.

After the discovery of the cave housing Ruby Falls the tunnelers kept digging to locate the original cave they were searching for, the Lookout Mountain caverns, which they reached 1,120 feet underground. On December 30, 1929 the Lookout Mountain caverns were open to the public, and by the following year in June the Ruby Falls cave was expanded and opened as well. By 1935 the lower of the two caves was blocked off due to Ruby Falls being the far more popular of the two caves.

In 1954, the pathway around the basin was cut in order to allow tourists a better view of the falls. This began the tour-related quip regarding not drinking the falls' water. Though pure and thus safe to drink, it has large concentrations of magnesium from the strata of the mountain, which makes it a natural laxative.

In 1975, the secondary exit from the falls to the base of the mountain was cut. This was to comply with recreation regulations in Tennessee. The secondary exit is used in the event that the main shaft elevator fails. This secondary exit was used for the popular Ruby Falls Haunted Cavern until 2017 when the event was renamed Dread Hollow and was moved to a new location. The haunted attraction is open to the public from late September, through October.

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