"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 also maintain - again with perfect truth - that mystery is more than half of beauty, the element of strangeness that stirs the senses through the imagination.
One thing that was passed on from generation to generation in my family, over seven generations in 200 years, was never give up. That's the way we live.