A worker repaints the colour of a royal tomb's building of the Western Qing Tombs in Yixian County, north China's Hebei Province, April 2, 2021. The maintenance and fixing of the Western Qing Tombs is underway in Yixian County of Hebei. (Xinhua/Zhu Xudong)

A worker fixes the wooden structure of a royal tomb's building of the Western Qing Tombs in Yixian County, north China's Hebei Province, April 2, 2021. The maintenance and fixing of the Western Qing Tombs is underway in Yixian County of Hebei. (Xinhua/Zhu Xudong)

A worker repaints the colour of a royal tomb's building of the Western Qing Tombs in Yixian County, north China's Hebei Province, April 2, 2021. The maintenance and fixing of the Western Qing Tombs is underway in Yixian County of Hebei. (Xinhua/Zhu Xudong)

A worker fixes the wooden structure of a royal tomb's building of the Western Qing Tombs in Yixian County, north China's Hebei Province, April 2, 2021. The maintenance and fixing of the Western Qing Tombs is underway in Yixian County of Hebei. (Xinhua/Zhu Xudong)

Workers fix a royal tomb's building of the Western Qing Tombs in Yixian County, north China's Hebei Province, April 2, 2021. The maintenance and fixing of the Western Qing Tombs is underway in Yixian County of Hebei. (Xinhua/Jin Haoyuan)