May 15, 2015 10:00 am 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 1:37 Pro-Palestinian protesters gather outside White House correspondents' dinner 2:05 How ‘Love Is Blind' made Vanessa Lachey and Nick Lachey's marriage stronger 5:49 Kelly Clarkson hilariously attempts handmade pasta with chef Evan Funke 1:59 Ellen DeGeneres jokes about being ‘kicked out of show business' 1:36 O.J. Simpson's cause of death revealed