"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.
With three people known as St. Valentines linked with the 14th February, it is unclear which one the day actually honors. St. Valentine of Rome was beheaded for performing weddings in secret.