May 15, 2015 2:00 pm Have a Mega Adventure at Louisville Mega Cavern Audrina Patridge explores the 4,000,000 square feet that is Louisville Mega Cavern where BMX biking, a ropes course, and ziplining are all underground. US & World Videos 5:49 Kelly Clarkson hilariously attempts handmade pasta with chef Evan Funke 1:36 O.J. Simpson's cause of death revealed 2:03 Does Shakira still believe in love following Gerard Piqué split? 2:36 Super dad makes Mario-themed obstacle course for son's birthday 1:59 Ellen DeGeneres jokes about being ‘kicked out of show business'
