"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.
The vatican had music which was forbidden to be copied and was only played twice per year. It was secret for almost 150 years until a 14-year-old mozart heard it and transcribed it from memory.