People visit the national museum of natural history in Ljubljana, Slovenia, June 20, 2020. Over 60 museums and galleries in more than 50 Slovenian cities and towns opened their doors on Saturday night for the 18th Summer Museum Night. The Summer Museum Night, held by the Slovenian Museums Association, usually takes place on the third Saturday in June every year from 6 p.m. local time to midnight. (Xinhua/Peng Lijun)

People visit the Slovenian National Museum in Ljubljana, Slovenia, June 20, 2020. Over 60 museums and galleries in more than 50 Slovenian cities and towns opened their doors on Saturday night for the 18th Summer Museum Night. The Summer Museum Night, held by the Slovenian Museums Association, usually takes place on the third Saturday in June every year from 6 p.m. local time to midnight. (Xinhua/Peng Lijun)

A staffer wearing a face mask walks at the Slovenian National Museum in Ljubljana, Slovenia, June 20, 2020. Over 60 museums and galleries in more than 50 Slovenian cities and towns opened their doors on Saturday night for the 18th Summer Museum Night. The Summer Museum Night, held by the Slovenian Museums Association, usually takes place on the third Saturday in June every year from 6 p.m. local time to midnight. (Xinhua/Peng Lijun)

People visit the national museum of natural history in Ljubljana, Slovenia, June 20, 2020. Over 60 museums and galleries in more than 50 Slovenian cities and towns opened their doors on Saturday night for the 18th Summer Museum Night. The Summer Museum Night, held by the Slovenian Museums Association, usually takes place on the third Saturday in June every year from 6 p.m. local time to midnight. (Xinhua/Peng Lijun)

People visit the national art gallery in Ljubljana, Slovenia, June 20, 2020. Over 60 museums and galleries in more than 50 Slovenian cities and towns opened their doors on Saturday night for the 18th Summer Museum Night. The Summer Museum Night, held by the Slovenian Museums Association, usually takes place on the third Saturday in June every year from 6 p.m. local time to midnight. (Xinhua/Peng Lijun)

A tourist visits the Slovenian National Museum in Ljubljana, Slovenia, June 20, 2020. Over 60 museums and galleries in more than 50 Slovenian cities and towns opened their doors on Saturday night for the 18th Summer Museum Night. The Summer Museum Night, held by the Slovenian Museums Association, usually takes place on the third Saturday in June every year from 6 p.m. local time to midnight. (Xinhua/Peng Lijun)