Tourists gather on a bridge at a scenic spot in Kaifeng, Central China's Henan Province, April 6, 2013. Many scenic spots around Kaifeng were overcrowded by visitors who came to enjoy leisure time during the Qingming Festival holiday. (Xinhua/Wang Song)

Tourists visit a scenic spot in Kaifeng, Central China's Henan Province, April 6, 2013. Many scenic spots around Kaifeng were overcrowded by visitors who came to enjoy leisure time during the Qingming Festival holiday. (Xinhua/Wang Song)

Tourists look out from a bridge at a scenic spot in Kaifeng, Central China's Henan Province, April 6, 2013. Many scenic spots around Kaifeng were overcrowded by visitors who came to enjoy leisure time during the Qingming Festival holiday. (Xinhua/Wang Song)

Tourists gather on a bridge to look at performance on a river in a scenic spot in Kaifeng, Central China's Henan Province, April 6, 2013. Many scenic spots around Kaifeng were overcrowded by visitors who came to enjoy leisure time during the Qingming Festival holiday. (Xinhua/Wang Song)

Tourists visit a scenic spot in Kaifeng, Central China's Henan Province, April 6, 2013. Many scenic spots around Kaifeng were overcrowded by visitors who came to enjoy leisure time during the Qingming Festival holiday. (Xinhua/Wang Song)