Experience the magic of the holiday season like never before at Louisville Mega Cavern, home to the world's only underground holiday light show! "Lights Under Louisville" is back for its 17th year, dazzling visitors with over 7 million lights and 40 themed displays. Prepare to be amazed as you drive your own vehicle through the cavern's festive passageways, surrounded by nearly 1,000 illuminated characters and stunning new projections.