Ancient builders slid 100-ton rocks on ice paths to construct China's Forbidden City
On a first-time trip to Beijing for an engineering conference last year, Howard Stone visited the Forbidden City, the seat five centuries of dynastic rule since the Ming Dynasty in the 15th century A.D., and a historical site today. After stopping by several intricately carved, massive, single-rock structures, someone in Stone's group marveled at the skill and smarts needed to haul such massive rocks into place.
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