Philadelphia has positioned itself as one of the most livable and vibrant cities in U.S. We're poised to become one of the major tech hubs on the east coast. Foodies have a near endless selection of restaurant choices. We have the largest urban park of any city in the world. Locals aren't the only ones who've noticed Philadelphia's revival; check out the 2016 Best Cities to Travel To by Lonely Planet. Can you guess which is ranked number 1?