Chinese architecture has evolved over time from ancient styles to modern skyscrapers. Traditional Chinese buildings were based on principles of symmetry and were usually long and low to the ground, often made of materials like wood, brick or tile. During the Han Dynasty, Buddhism introduced new styles like pagodas. Some ancient Chinese believed ghosts could not turn corners, so buildings included protective turns or walls near entrances. The Forbidden City served as China's imperial palace for 500 years, housing nearly 1,000 structures according to traditional design principles and social ranks. Modern Chinese architecture ranges from old palaces to new towering buildings.