Professional ice climber Will Gadd becomes first person ever to scale an ice wall at the Niagara Falls. Gadd says he had to do it after a part of the 167-foot Horseshoe Falls froze over due to the sub-zero winter temparatures. Gadd called the hour-long climb 'really rewarding', despite being battered by ice spray as the falls fell past him at 70 miles per hour Continue reading...