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 1:40 Charlie Puth reacts to Taylor Swift's ‘The Tortured Poets Department' name-drop 2:52 Severe weather kills at least 5 as tornadoes rip through Midwest and South 0:48 World Central Kitchen to resume operations in Gaza 3:26 Confrontations occur at UCLA campus amid ongoing protests 0:57 Fights break out at UCLA between pro-Palestinian, pro-Israel supporters