Photo taken on March 29, 2021 shows a part of the Panathenaic Stadium and Acropolis of Athens in background in Athens, Greece. A new lighting system installed at Athens' Panathenaic stadium was unveiled on Monday evening. The marble main venue of the first modern Olympic Games of 1896 is now illuminated with thousands of LED bulbs to reduce light pollution and save energy. (Photo by Lefteris Partsalis/Xinhua)
