July 27, 2021, Beijing, China: Tourists wear masks during their visit at the temple of heaven in Beijing..Temple of Heaven is located in the southeast of Beijing and existed for more than 500 years. Temple of Heaven was built for emperors of Ming dynasties (1368-1644 AD) and Qing dynasties(1644-1912 AD) to worship the heaven. Temple of Heave is the largest and best-preserved architectural complex for sacrifice in China. (Credit Image: © Sheldon Cooper/SOPA Images via ZUMA Press Wire)