What were the ahu platforms used for on Easter Island?

On Easter Island, the ahu platforms served as vital ceremonial and structural foundations. Their primary purpose was to support the island's iconic moai statues, which represented deified personalities.1

During the middle period (c. 1050–1680), these platforms were specifically engineered to be strong enough to hold increasingly taller and heavier stone busts, with some platforms supporting up to a dozen statues facing inland. In addition to their role as pedestals for these monuments, the ahu platforms were also constructed to contain burial chambers. These structures typically featured open courtyards on their landward sides, serving as centers for ritual activity.1