It is difficult to describe how crowded the subways are at rush hour.  But the following picture shows why rush hour may not be the best time to return from grocery shopping.  We thought the subway car was full, then a few more waves of people entered.
We are learning more about the various dynasties in China.  We are within an hour's bus ride to a an exhibit about the Ming Dynasty (14th century to 17th century).  The pictures that follow are from that visit.
"The 
Ming Dynasty, also 
Empire of the Great Ming, was the 
ruling dynasty of 
China for 276 years (1368–1644) following the collapse of the 
Mongol-led 
Yuan Dynasty. The Ming, described by some as "one of the greatest eras of orderly government and social stability in human history", was the last dynasty in China ruled by ethnic 
Han Chinese. Although the primary capital of 
Beijing fell in 1644 to a rebellion led by 
Li Zicheng (who established the 
Shun Dynasty, soon replaced by the 
Manchu-led 
Qing Dynasty), regimes loyal to the Ming throne – collectively called the 
Southern Ming – survived until 1662."
 
Building that housed the exhibits.
 
Above is a model of the type of ship used by Zheng He, a great Chinese admiral who was active in the 15th century.
"Zheng He was placed as the admiral in control of the huge fleet and armed forces that undertook these expeditions. 
Wang Jinghong was appointed his second in command. Preparations were thorough and wide-ranging, including the use of such numerous linguists that a foreign language institute was established at Nanjing. Zheng He's first voyage departed July 11, 1405, from 
Suzhou and consisted of a fleet of 317 ships holding almost 28,000 crewmen.
Zheng He's fleets visited 
Brunei, 
Thailand and 
Southeast Asia, 
India, the 
Horn of Africa, and 
Arabia, dispensing and receiving goods along the way. Zheng He presented gifts of gold, silver, 
porcelain, and 
silk; in return, China received such novelties as 
ostriches, 
zebras, 
camels, and 
ivory from the 
Swahili. The 
giraffe he returned from 
Malindi was considered to be a 
qilin and taken as proof of the 
favor of heaven upon the administration.
While Zheng He's fleet was unprecedented, the routes were not. Zheng He's fleet was following long-established, well-mapped routes of trade between China and the 
Arabian peninsula employed since at least the 
Han Dynasty. This fact, along with the use of a more than abundant amount of crew members that were regular military personnel, leads some to speculate that these expeditions may have been geared at least partially at spreading China's power through expansion."
 
A view of the Yangtze River from the top of the building shown below.
 
 
A part of the old city wall of Nanjing