"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 do whatever we wish to do provided our wish is strong enough. What do you want most to do? That's what I have to keep asking myself, in the face of difficulties.