Chi Ky Thanh in Shandong province has an inner wall built with scrap metal from the metallurgical process, helping it withstand cannonballs.
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Scrap helps ancient citadel stand firm against cannons
VnExpress•24/07/2023Chi Ky Thanh in Shandong province has an inner wall built with scrap metal from the metallurgical process, helping it withstand cannonballs.
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