Beijing, the capital city of China, is a vast metropolis rich with historical significance and modern advancements. It is known for its blend of ancient culture and urban development. Among its most famous landmarks is the Forbidden City, a historic palace complex that hosted Chinese emperors for over 500 years. Nearby is Tiananmen Square, one of the world's largest public squares, surrounded by monuments and museums including the mausoleum of Chairman Mao Zedong. The Temple of Heaven, an imperial complex of religious buildings, and the Summer Palace, with its elaborate gardens, are other notable historical sites. Beijing serves as a major hub for national highways, expressways, railway, and high-speed rail networks as well as the Beijing Capital International Airport, one of the busiest in the world. The city is also facing environmental challenges like pollution and traffic congestion. As the cultural center of China, it boasts numerous cultural highlights, including the National Museum of China and the Great Wall of China, which stretches from its northern borders. Beijing's cuisine and extensive hutongs are also integral to its cultural tapestry.