Temple of Heaven Park is a 5A attraction in Dongcheng District, Beijing, at No.1 Tiantandongli. It is a sacred site where emperors of the Ming and Qing dynasties offered sacrifices to heaven and prayed for good harvests. Built in 1420, the 18th year of Yongle in the Ming Dynasty, it is the largest existing ancient sacrificial building complex in China. The park covers about 2.73 million square meters and is surrounded by two altar walls, dividing it into the Inner Altar and Outer Altar. Its layout symbolizes the traditional idea of “the sky is round and the earth is square.”