"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.
There is a widespread difficulty in the Muslim world, which has to do with how the people are taught about examining their own history. A whole range of stuff has been placed off limits.
