"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.
When my son was born, and after a day of lying-in I was told that I could leave the hospital and take him home, I burst into tears. It wasn't the emotion of the moment: it was shock and horror.
If you realize that all things change, there is nothing you will try to hold on to. If you are not afraid of dying, there is nothing you cannot achieve.