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A version of the Hadrian's Wall. Discovered in 2005, the Long Wall of Quẚng Ngãi is a majestic architectural construction that remains in its original state. Built over 500 years mainly with stones and earth, with an average high of 2 m, the wall spans over 113 km with several forts, roads, and military depots. The Wall was constructed in the early days by the Viet settlers when this region was Vietnam southern frontier. It later was upgraded and fortified by the Nguyen Emperors. The wall was built to regulate trade and defense with the hostile Champa civilization in the south.