The heiau most commonly preserved are war temples of the later period of history (e.g.
Pu'ukohola Heiau National Historic Site). They are composed of large stone platforms with various structures built upon them. The structures were used to house priests, sacred ceremonial drums, sacred items, and
cult images representing the
gods associated with that particular temple. There were also altars (Ahu) on which to offer
sacrifices (plant, animal and human). The heiau were sacred places; only the
kahuna (priests) and certain sacred
ali'i (high chiefs) were allowed to enter. The largest heiau known to exist, Hale O Pi'ilani Heiau, is a massive, three-acre (12,000-square-meter) platform with fifty-foot retaining walls, located in
Hāna on
Maui. Built for Pi'ilani, it dates to the 13th century. Agricultural heiau, called generally
Hale-o-Lono for the god of fertility, can be found today on Oahu at Makaha (Kaneaki heiau - fully restored) and in Hawaii Kai (Pahua heiau - partially restored). The Kaneaki heiau was built in the 17th century, containing grass and thatched huts that were chambers used for prayer and meditation. The ruins of a healing heiau, Keaiwa ("the mysterious"), are located at the entrance to Keaiwa State Park in Aiea. Puuhonua o Honaunau, in South Kona on the island of Hawaii, is a
place of refuge. It incorporates a heiau complex within it. Because the land of heiau was sacred, it was not unusual for successive generations to add to original structures and the heiau purpose could change over time. An example is
Ulupo heiau in Kailua on Oahu, which is said to have been built by the
menehune, that is, a long time ago. It is thought to have been used first as an agricultural heiau and later as a luakini. ==Destruction==