Shanghai, located on China's central coast, is the country's biggest city and a global financial hub. The city's heart is the Bund, a famed waterfront promenade lined with colonial-era buildings. Across the Huangpu River rises the Pudong district’s futuristic skyline, including the 632m Shanghai Tower and the Oriental Pearl TV Tower, with distinctive pink spheres. Shanghai is also known for its historical landmarks such as the City God Temple and the Yu Garden, as well as the extensive and growing Lujiazui financial district. It has a rich collection of buildings and structures of various architectural styles. The city is a blend of cultures, from the traditional 'Shikumen' houses to the modern high-rise buildings. Shanghai serves as an important cultural, commercial, and financial center of China. It has a high population density, with over 24 million residents. Transportation in Shanghai includes one of the world’s largest subway systems. It is growing rapidly, with development reflective of China's accelerated economic growth. Shanghai hosts numerous national and international events, including fashion weeks and the Shanghai International Film Festival.