A man wearing a face mask cycles in central London, Britain, on May 28, 2020. (Xinhua/Han Yan)

People walk outside the reopened Colosseum in Rome, Italy, June 1, 2020.(Xinhua/Cheng Tingting)

Parisians walk on a street near the Place des Vosges in Paris, France, May 31, 2020. (Photo by Aurelien Morissard/Xinhua)

People keep social distancing at a beach during the COVID-19 pandemic in Barcelona, Spain, May 29, 2020. (Barcelona City Hall/Handout via Xinhua)