This was not a typical day at the office. Standing at the edge of a nine-story tower on a late Wednesday morning, I squinted across a vast chasm of sunlit sandstone and limestone. A cable hardly wider ...

Rick Rice tests out the zip line on Darren Danielson’s property outside of Duluth, Minn. When the Danielson family decided to build a zip line on the property, they thought big – and high. After ...