Ahu Akivi is a particulary sacred place on Rapa Nui. The site has seven moai, all of equal shape and size, and is known as a celestial observatory that was set up around the 1500s. The site is located inland, rather than along the coast. These moai are the only ones on the island which face outwards towards the sea.
A particular feature of the seven identical moai statues is that they exactly face sunset during the Spring Equinox and have their backs to the sunrise during the Autumn Equinox. Such an astronomically precise feature is seen only at this location on the island.