Whether they re man-made mines or natural sinkholes, these massive holes around the world are anything but the pits. Whether they re man-made mines or natural. May 09, 2017 The world is home to many incredible destinations that have yet to be overrun by tourists. Inspired by a Quora thread about the best unknown travel. May 10, 2015 There are only so many times you can hike the Great Wall of China, take in the lights of Times Square, or steady the Leaning Tower of Pisa before these.