How long did you stay in Guangzhou? How well do you know Guangzhou? I thought I knew a lot about Guangzhou, and suddenly I found that there was still a lot of cold knowledge about Guangzhou that I didn&;t know! How many of the following 48 things have you heard? Guangzhou is 2230 years old this year! It is a rare metropolis in the world where the city site has not changed for more than two thousand years.