Hakka tulou are traditional communal living structures built by the Hakka people in southern China. These unique earthen buildings are typically round or square and can house multiple families. They are designed to provide safety and security, featuring thick walls made from rammed earth, which help regulate temperature and protect against intruders. Constructed mainly between the 12th and 20th centuries, Hakka tulou are often surrounded by beautiful landscapes. Many of these structures are recognized as UNESCO World Heritage Sites, showcasing the rich cultural heritage and architectural ingenuity of the Hakka community.