Easter Island is full of large and small human head boulders, called Moai, the photo shows the site where the stone statues are made, only the head is exposed. The stone statues are carved from volcanic rock, built around the 10th to 16th centuries, 7 - 10 meters high, weighing dozens of tons, the heaviest up to 200 tons. Because of the loss of historical and cultural records, who made the stone statues, what symbols, how to carry, etc., is still a mystery.