A visitor takes a photo inside a 1:1 replica of the Dunhuang Mogao Grottoes at a Dunhuang cultural relic exhibition held in Hangzhou, East China's Zhejiang Province on July 18, 2023. Grotto No.285, one of the earliest grottoes to be dated by experts, was created in the fourth year of Emperor Wen's reign during the Western Wei Dynasty (535-556). Photo: VCG