Those who like the Great Smoky Mountains and have no fear of heights might want to plan a road trip to Tennessee in the near future. What's being billed as the longest pedestrian suspension bridge in the US will open in Gatlinburg on May 17. The SkyBridge at the top of Crockett Mountain, reached via a pre-existing chairlift, stretches 680 feet across a valley and is roughly 140 feet high, reports CNN. The developer claims it's the longest such bridge in North America, but the boast is debatable. Canada's Kelowna Mountain has a suspension bridge claimed to be more than 800 feet long. However, an official at Boyne Resorts, which built SkyBridge, tells the Knoxville News Sentinel that the Tennessee bridge is the longest in terms of how far pedestrians actually get to walk. (More Tennessee stories.)