Beijing is the capital of the People's Republic of China, the most populous country in the world. With a population of 21,500,000 people, it is the nation's second-largest city after Shanghai. It was also the seat of the Ming and Qing dynasty emperors until the establishment of the Republic of China in 1911. Beijing is the political, educational and cultural centre of the country and as such it is rich in historical sites and important government and cultural institutions.
The city is marked by its flatness and arid climate. There are only three hills to be found in the city limits (in Jingshan Park to the north of Forbidden City) and mountains surround the capital on three sides. Like the configuration of the Forbidden City, Beijing has concentric "ring roads", which are actually rectangular, that go around the metropolis and serve as good reference points as one attempts to move about the city. Beyond the ring roads are the most-visited portions of the Great Wall of China, which witnesses visitors the world over and Beijing serves as a good headquarters for those who wish to gaze upon one of mankind's more memorable and lasting structures.
Beijing was host to the 2008 Summer Olympic Games, and will also host the 2022 Winter Olympic Games, the first only city to host both these events.