On January 21, 2013 Mammoth Cave National Park will be offering free Mammoth Passage Cave Tours. Tour departure times are 9:15, 11:00, 1:00 & 3:00. Tickets are required for admission. The complimentary tickets may be picked up at the visitor center prior to tour departure and are issued on a first-come first-served basis. The tour is limited to 40 participants per trip so come early!