"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
We can not learn without pain....the intention makes the crime...i count him braver who overcomes his desires than him who conquers his enemies; for the hardest victory is the victory over self.
If your determination is fixed, I do not counsel you to despair. Few things are impossible to diligence and skill. Great works are performed not by strength, but perseverance.