"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.
Pains do not hold a marriage together. It is threads, hundreds of tiny threads which sew people together through the years. That's what makes a marriage last - more than passion or even sex.