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Each Olmec head is unique, leading archeologists to believe they may have been made in honor of ancient Mesoamerican rulers.

On average, they stand 13 feet high and weigh 14 tons, human heads-on-torsos carved in the ... and the significance of the nearly 900 giant moai that punctuate Easter Island's barren landscape.

3/3 Just before WWII, a giant stone head is found in Mexico, leading to a lost civilisation.