Philadelphia is the earliest capital of the United States. The Old City refers to the area of one square kilometer extending from the center of Independence Square. Basically within this area, you can see a very dense historical building every step of the way. If you are driving, you will feel that traffic jams sometimes occur. This historical city has witnessed the historical development of the entire United States. Most places are free to enter, which is quite good. Tourist services are also very good. You compare Perfect planning and route.