2018

06-08

14:29

Source:
Xiongan.gov.cn

In pics: Ancient underground military tunnel in Xiongan New Area

Photo taken on June 6, 2018 shows the historical relics site of an underground military tunnel, which was dug along the border between the Northern Song Dynasty (960-1127) and the Liao Dynasty (907-1125) in Xiongxian County, North China's Hebei Province. Its structure and function are so sophisticated that many scholars call it "the underground Great Wall." (Xiongan/Wang Yongkang)

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