A heiau is a Hawaiian temple. Many types of heiau existed, including heiau to treat the sick (heiau hōʻola), offer first fruits, offer first catch, start rain, stop rain, increase the population, ensure health of the nation, achieve success in distant voyaging, reach peace, and achieve success in war (luakini). Only the luakini was dedicated through human sacrifice. There are two types of luakini. They were called the ʻohiʻa ko and hakuʻohiʻa.
Heiau were made in different architectural styles depending upon their purpose and location. At the official end of Hawaiian religion in 1819, many were deliberately destroyed, while others were allowed to fall into disrepair. Some structures have been fully restored today.
Heiau were made in different shapes depending upon their purpose. A heiau could have been in many different forms, such as simple stone markers to large stone platforms, both parts of human sacrificial temples.  They could be rectangular, square, or rounded. Some consisted of simple earth terraces, while others were elaborately constructed stone platforms. They could be placed on hills, cliffs, level earth, valleys and on the coastline touching the sea. Some koʻa or fishing shrines were built underwater. Heiaus of the people varied in size. Large heiaus were built by prominent people while small heiaus were built by the humble.
American missionary Hiram Bingham described a heiau he saw on route hiking between the summits of Mauna Kea and Hualalai. Made of piled lava rock, it was a square of 100 feet (30 m), with walls eight feet high and four feet thick. A doorway led through the middle of the north wall. Eight pyramids surrounded the outside of the temple. Made of piled lava rock, they were 12 feet (3.7 m) in diameter and 12 to 15 feet (4.6 m) high.
Heiau types 
The luakini poʻokanaka were large heiaus. Only the Aliʻi nui of an island or moku could use this type of heiau. Other chiefs or the makaʻainana that built this type of heiau were considered rebels. This type of heiau was usually built alongside coastlines, in the interior of the land, or on mountain sides. The largest heiau on Oahu is Puʻu O Mahuka, which covers almost two acres of land.
Preserved sites 
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 currently known to exist, Hale O Pi'ilani Heiau, is a massive, three-acre platform with fifty foot retaining walls located in Hāna on Maui. Built for Pi'ilani, it dates back to the 13th century.
Agricultural heiau, called generally Hale-o-Lono for the god of fertility, can be found today on Oʻahu 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 ʻAiea.
Puʻuhonua o Honaunau, in South Kona on the island of Hawaiʻi, itself is a place of refuge, but it includes 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 for the purposes of the heiau to change over time. An example is Ulupo heiau in Kailua on Oʻahu, which is said to have been built by the menehune, that is, a long time ago, and is thought to have been used first as an agricultural heiau and later as a luakini.
The kapu or 'ʻai kapu system was abolished in October, 1819 by Liholiho, Kamehameha II. The abolition of the kapu system ended the use of heiau as places of worship and sacrifice. A period referred to as the 'Ai Noa or "free eating" followed. Missionaries arrived in 1820, and most of the aliʻi converted to Christianity, including Kaʻahumanu and Keōpūolani, but it took 11 years for Kaʻahumanu to proclaim laws against ancient religious practices. All heiau were officially abandoned; most were destroyed over the years. Often they were broken up and plowed under to make way for fields of sugar cane. However, some of the families who were responsible for the heiau have continued the tradition of caring for them to this day.
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- Kauwaha Heiau
- Pahau Heiau
- Pueo Heiau
- Kaunupou Heiau
- Kaunuapua Heiau
- Puhi Ula Heiau
- Kamakau, Samuel. The Works of the People of Old, pp. 129-134
- Samuel Kamakau, "Ka Poe Kahiko; The People of Old" (Honolulu:Bishop Museum Press, 1993), 130.
- "Pu'ukohala Heiau: History & Culture", Natural Park Service, 15 August 2012. Retrieved on 13 November 2012.
- Kamakau, p. 135
- Samuel Kamakau, "Ka Poe Kahiko; The People of Old" (Honolulu:Bishop Museum Press, 1993), 131.
- Bingham, Hiram. A Residence 21 Years in the Sandwich Islands, Tuttle (1981) p. 397
- Pu'u O Mahuka Heiau State Historic Site, Department of Land and Natural Resources, N.d. Retrieved on 13 November 2012.
- Engledow, Jill (May, 2009). "A Heiau in the Garden". Native Soul - The Culture and Aloha of Maui, Hawaii 13 (3) (Maui No Ka 'Oi Magazine). Retrieved 2009-08-17.
- Kaneaki Heiau Oahu, Hawaii Web, N.d. Retrieved on 13 November 2012.
- "> Parks > Oahu > Keaiwa Heiau State Recreation Area". Hawaii State Parks. Retrieved 2009-09-27.
- "> Parks > Oahu > Ulupo Heiau State Historic Site". Hawaii State Parks. Retrieved 2009-09-27.
Further reading 
- Pukui, Mary Kawena; Samuel Hoyt Elbert (1986) . Hawaiian Dictionary (Revised ed.). Honolulu: University of Hawaii Press. ISBN 0-8248-0703-0.
- Isabella Aiona Abbott (1992). Lāʻau Hawaiʻi: Traditional Hawaiian Uses of Plants. Honolulu: Bishop Museum Press. ISBN 0-930897-62-5.
- Te Rangi Hīroa (1957). Religion. Arts and Crafts of Hawaii, No. 45 XI. Honolulu: Bishop Museum Press. ISBN 0-910240-34-5.