National Park Week is April 21 through 29 and Mammoth Cave National Park is offering free tours.
Visitors can pick up the free tickets at the visitor center ticket office before tour times. From 10 a.m. to 1 p.m. CDT Saturday and April 28, free self-guided Discovery tours are offered. The self-guided Discovery tour is a three-quarter mile tour lasting about 30 minutes.
Sunday through Friday and April 29, the park offers free Mammoth Passage Tours at 9, 10 and 11:15 a.m. and 12:15, 1:15, 2:45 and 4:15 p.m. CDT.