Digital caves are a revelation for tourists - and offer respite for ancient historical sites. Jane O'Brien explores how 3D recreations can be even better than the real thing.
Atmospheric music greets visitors to Cave 220 - part of the Mogau Grottoes of Dunhuang, an oasis on the ancient Silk Road in China's Gobi Dessert.
A flickering torch offers a tantalising glimpse of the exquisite murals painted by Buddhist monks some 1,400 years ago. And then suddenly, the cavern is ablaze with light, its beauty fully revealed in dazzling colour and extraordinary detail.
Thats one way to preserve history.