A subway is not just an important form of transport. It is also a window for other people to learn about local cultures.
Beijing， China
The Beijing Subway was opened in 1969 and is the oldest subway system in China. It has added some modern technologies. All stations now have touch-screen maps. In some stations， people can also see traditional Chinese cultures. On the walls of a few stations of Line 8， there are some pictures of blue and white porcelain （青花瓷）.
Stockholm， Sweden
The system of the Stockholm Subway has 100 stations in use， of which 47 are underground and 53 above ground. The first subway line for Stockholm was opened in 1950. The Stockholm Subway is well-known for its decoration of the stations. It is called the longest art gallery in the world. Over 90% of its stations are decorated with paintings. A few stations are decorated with red bedrocks （岩床）. This makes you feel as if you are in a cave.
London， UK
The London Underground or the Tube is the oldest subway in the world. It was opened in 1863. During World War Ⅱ， it was used to protect people from German plane attacks （袭击） on London. Now， it is a symbol of the city. There is no air conditioning （空调） in the trains， so it is very hot in summer.
New York， US
The New York City Subway has the largest public transportation system in the world， with 469 stations. It is also one of the world's oldest public systems. The New York City Subway runs 24 hours a day. It has a higher-speed express train on almost every line. You can get to your destination （目的地） promptly. The trains themselves are full of fun； you will see people doing moonwalk dances like Michael Jackson， playing the guitar and singing.
