Liu Junjun (L), an associate researcher from the cultural heritage monitoring center of Jiayuguan Silk Road (the Great Wall) cultural research institute, patrols the Jiayu Pass scenic area with a colleague in Jiayuguan City, northwest China's Gansu Province, July 14, 2023. In recent years, cultural heritage protection institutions have increased the investment in the technological protection of the Great Wall. Institutions utilize technological equipment to collect data, analyze metrics and detect any possible damage. These methods guarantee the implementation of effective preservation and restoration measures in time and the Great Wall well-preserved. (Xinhua/Fang Xin)