Technology enlisted in ongoing battle to preserve grottoes

LANZHOU - Summer is the busiest season for staff at the Mogao Grottoes, as more than a third of the annual visitors to the UNESCO World Heritage site arrive during the vacation time.

Last year, the tourist attraction welcomed almost 2 million visitors.

Sitting in Dunhuang, Northwest China's Gansu Province, the Mogao Grottoes' 735 caves are home to a priceless collection of Buddhist artwork - more than 2,000 colored sculptures and 45,000 square meters of murals - all created by ancient worshippers.