I know both the Mandarin and Shanghai dialects. Mandarin is the official language in China. Shanghai is the largest city in China, and uses a distinct dialect as well as the official language. Shanghai is one of the largest cities in the world. My parents, two brothers, a niece and a nephew live in Shanghai.
My husband, my son and I visited China for the new millennium, as shown in the following picture. The tower is really leaning and is older than the one in Pisa.