The former Chinese capital, Nanjing, is located in a fantastic landscape on the banks of the Yangtze River and at the foot of Purple Mountain. This city of 5.5 million residents is the second largest city in eastern China. Among its greatest attractions is the grave of the Ming emperor Zhu Yuanzhang. The founder of the Ming dynasty is the only Ming emperor that was buried outside of Beijing. Remains of the city wall from this period can also still be seen. Among the other site worth visiting are the Yangtze Bridge, which is almost 7 kilometres long and features a viewing deck, and the observatory on Purple Mountain along and the South Tang mausoleums, which are known as the Underground Palace.