Visitors scan QR codes to commemorate victims of the Nanjing Massacre and Bombing of Chongqing, both committed by Japanese troops in China during World War II, at the theme park Foreigner Street in Southwest China’s Chongqing municipality, March 31, 2015. Visitors can take part in an online memorial, by lighting candles, presenting flowers, ringing bells and planting trees. [Photo/ecns.cn]