Ruby Falls is a remarkable underground feature just outside of Chattanooga. Named after the wife of their discoverer, the falls are the tallest and deepest falls in North America that are publicly accessible.
The Falls are an affirmation that there is always something new to discover. They remained undiscovered until 1928 when Leo Lambert encountered an access point while attempting to drill an elevator shaft to an already known underground chamber deep in Lookout Mountain. Though it took Leo hours to reach the falls while crawling through incredibly narrow crevices, today, the falls are accessible as part of a relatively level walk from a bank of elevators.
You can only see the Falls as part of a tour, which, these days, require reservations in advance along with masks. While we are terrible about planning, the experience was worth committing to a time slot. Tour sizes are limited, but it still was worth visiting as early as possible on a weekday for the smallest tour groups.