"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 start really missing London when I go away. I have a little flat, but very central. I live above a pub and you'd think it'd be a nightmare, but I like hearing the music and it's quite comforting.