Aerial view of the underwater Great Wall located in the Panjiakou reservoir on May 8, 2023 in Chengde, Hebei Province of China. The underwater Great Wall belongs to the Panjiakou castle which was an important military pass in Ming dynasty (1368-1644). After the Panjiakou reservoir was built in 1975, some part of the Great Wall was submerged. (Photo by Zhai Yujia/China News Service/VCG via Getty Images)
