"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.
I can forgive, but I cannot forget, is only another way of saying, I will not forgive. Forgiveness ought to be like a cancelled note - torn in two, and burned up, so that it never can be shown against one.
A belief in hell and the knowledge that every ambition is doomed to frustration at the hands of a skeleton have never prevented the majority of human beings from behaving as though death were no more than an unfounded rumour, and survival a thing not beyond the bounds of possibility.