The world’s largest underground bike park is scheduled to open January 1st, 2015. Built in a cavern in Louisville, Kentucky, this 320,000 square foot bike park will feature 40 trails for beginner and intermediate riders. For decades it was just a hole in the wall, but is now rated number one tourist attraction on tripadvisor.com for Louisville. After years of dragging limestone from the cave, now they’re dragging in dirt…counterproductive? We think not, sick idea!