Amazing place to visit close to Dunhuang! The two mandatory movies before heading to the grottos was annoying. however, once you are at the grottos, that annoyance is quickly forgotten. What sets this grotto apart from the other famous ones in China is the free English guides (french and german as well i think). i went in the off season and had an English guide to myself. it was very educational, and made the Mogao grottos more significant amd memorable than other grottos.