There is only a fifty-meter street in the old city of Philadelphia. I'm here on a special trip. I really like the feeling here. The 32 houses on both sides of the street were built between 1728 and 1836. At present, only two houses have been opened as museums. The rest of the old houses are inhabited by residents, and there is no sign of commercialization. Flowers adorn the front of the house. During the National Day, the Star-Spangled Banner became the most beautiful decoration.