I know two big and popular citys.They are Shengyang and Beijing.The population of about 20 million.So the population of Beijing is larger than Shengyang.The weather usually is cold in Shengyang and warm in Beijing.The Beijing weather is better than Shengyang.
There is the GreatWall and the Forbidden city.The Forbidden city is about 500 years old.The Great Wall is about thousands years old.Beijing is famous for the Great Wall and the Forbidden city.So Beijing is more famous than Shenyang.