People love pretty much the same things best. A writer looking for subjects inquires not after what he loves best, but after what he alone loves at all.
"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.