I dedicated one full day to downtown Philadelphia. I started rather early in the morning to e at the Independence National Historic Park Visitor Centre when it opened. There I got one of the tickets to the firsts tour to the Independence Hall, where the Declaration of Independence and the first version of the Constitution were elaborated and announced. The National Historic Park also hosts a couple of other historic buildings and artifacts such as the Congress Hall (which served as congress for a short time when Philadelphia was capital of the US), the Old City Hall and the Liberty Bell Center.
After exploring this historic centre for about two hours, I did a quite extensive walking tour to all the other interesting sights mentioned in my travel guide book, including Society Hill quarter, Waterfront with the Independence Seaport Museum, Old City with Elfreth’s Alley (the oldest street in the US), city centre with Reading Terminal Market and the Wanamaker Grand Court Organ in a historic department store building (today a branch of Macy’s), the Philadelphia Museum of Art, and finally Broad Street, Ritterhouse Square District and dinner in Chinatown.