Tourists take photos of the Hall of Prayer for Good Harvests at the Temple of Heaven in Beijing, capital of China, April 29, 2020. The Temple of Heaven, a UNESCO World Heritage Site temporarily closed due to the COVID-19 outbreak, reopened its three main building groups to the public on Wednesday. The reopened grounds, namely the Hall of Prayer for Good Harvest, the Imperial Vault of Heaven and the Circular Mound Altar, can be accessed by a limited number of visitors via online booking. (Xinhua/Peng Ziyang)

A tourist poses for a selfie in front of the Hall of Prayer for Good Harvests at the Temple of Heaven in Beijing, capital of China, April 29, 2020. The Temple of Heaven, a UNESCO World Heritage Site temporarily closed due to the COVID-19 outbreak, reopened its three main building groups to the public on Wednesday. The reopened grounds, namely the Hall of Prayer for Good Harvest, the Imperial Vault of Heaven and the Circular Mound Altar, can be accessed by a limited number of visitors via online booking. (Xinhua/Peng Ziyang)

A staff member disinfects a waste bin in front of the Hall of Prayer for Good Harvests at the Temple of Heaven in Beijing, capital of China, April 29, 2020. The Temple of Heaven, a UNESCO World Heritage Site temporarily closed due to the COVID-19 outbreak, reopened its three main building groups to the public on Wednesday. The reopened grounds, namely the Hall of Prayer for Good Harvest, the Imperial Vault of Heaven and the Circular Mound Altar, can be accessed by a limited number of visitors via online booking. (Xinhua/Peng Ziyang)

Tourists walk past the Hall of Prayer for Good Harvests at the Temple of Heaven in Beijing, capital of China, April 29, 2020. The Temple of Heaven, a UNESCO World Heritage Site temporarily closed due to the COVID-19 outbreak, reopened its three main building groups to the public on Wednesday. The reopened grounds, namely the Hall of Prayer for Good Harvest, the Imperial Vault of Heaven and the Circular Mound Altar, can be accessed by a limited number of visitors via online booking. (Xinhua/Peng Ziyang)

Tourists visit the Hall of Prayer for Good Harvests at the Temple of Heaven in Beijing, capital of China, April 29, 2020. The Temple of Heaven, a UNESCO World Heritage Site temporarily closed due to the COVID-19 outbreak, reopened its three main building groups to the public on Wednesday. The reopened grounds, namely the Hall of Prayer for Good Harvest, the Imperial Vault of Heaven and the Circular Mound Altar, can be accessed by a limited number of visitors via online booking. (Xinhua/Peng Ziyang)

Tourists visit the Hall of Prayer for Good Harvests at the Temple of Heaven in Beijing, capital of China, April 29, 2020. The Temple of Heaven, a UNESCO World Heritage Site temporarily closed due to the COVID-19 outbreak, reopened its three main building groups to the public on Wednesday. The reopened grounds, namely the Hall of Prayer for Good Harvest, the Imperial Vault of Heaven and the Circular Mound Altar, can be accessed by a limited number of visitors via online booking. (Xinhua/Peng Ziyang)