100 never looked so good: Hotel staff and visitors sing "Happy Birthday" around a 5-foot tall, 2,000-pound birthday cake in the lobby of the Omni William Penn Hotel to celebrate the hotel's 100th birthday Wednesday. Don't miss our historic interactive of the hotel: bit.ly/1RQoCWd (Photo by Bob Donaldson/Post-Gazette) #Pittsburgh #PGH #412 #WilliamPennHotel #OmniWilliamPennHotel