Each year the Louisville Mega Cavern is transformed into an underground holiday light display for the Christmas season, and allows the public to drive their vehicle through the cavern! Fido must remain in the car with you at all times. Enjoy a 30-minute ride through part of the 17 miles of underground passageways featuring over 900 lit characters and over 6 million points of light. Please refer to their online map for authorized routes. Due to road closures, GPS may not be accurate.