Beijing is the capital of the People's Republic of China and one of the most populous cities in the world. It is the second largest Chinese city by urban population after Shanghai and is the nation's political, cultural and educational center. It is home to the headquarters of most of China's largest state-owned companies, and is a major hub for the national highway, expressway, railway, and high-speed rail networks. The Beijing Capital International Airport is the second busiest in the world by passenger traffic.
Beijing has seven UNESCO World Heritage Sites-the Forbidden City, Temple of Heaven, Summer Palace, Ming Tombs, Zhoukoudian, Great Wall, and the Grand Canal. Beijing hosted the 2008 Summer Olympics and was chosen to host the 2022 Winter Olympics, which will make it the first and only city to ever host both events.