Can you name that landmark?

Known locally as “Wan-Li Qang-Qeng”, this massive landmark is more than 6,000 kilometers long, ranges up to 25 feet tall, and dates back to the 7th century BC. Can you name that landmark?
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Known locally as “Wan-Li Qang-Qeng”, this massive landmark is more than 6,000 kilometers long, ranges up to 25 feet tall, and dates back to the 7th century BC.
Can you name that landmark?