CHAOYANG, Aug. 3 (Xinhua) --The Niuheliang site museum in Chaoyang City, northeast China's Liaoning Province reopened to the public on Saturday after nearly half a year's refurbishment. The Niuheliang site is the largest known sacrificial site and tomb group of northeast China's Hongshan culture. The Hongshan culture is an important prehistoric archaeological culture dating back approximately 5,000 to 6,000 years.