Chinese architecture has a long history dating back thousands of years. Some key developments include ancient wooden structures influenced by Buddhism in the Han dynasty, the earliest stone pagoda built in 523 AD, and the Great Wall constructed starting in the 3rd century BCE. Architectural styles are typically classified based on their structure as pavilions, terraces, or multi-story buildings. Traditional residential architecture includes courtyard homes, while imperial structures feature elements like yellow roof tiles. Urban planning principles also incorporated feng shui beliefs. Modern Chinese architecture since the 1800s has blended traditional and Western influences, with Communist styles emphasizing simplicity and recent decades seeing innovative new designs.