This isolated National Historic Landmark is so impressive in size and atmosphere that it may give you what locals call "chicken skin" (goose bumps). Its foundations date to about AD 480, but the high priest Paao from Tahiti expanded the heiau several centuries later and it continued to be used by Hawaiian religious leaders. You can still see the lava slab where hundreds of people were sacrificed, giving this place a truly haunted feel. Visit with utmost care and respect.
Nearby is Kamehameha Akahi Aina Hanau, the birthplace of Kamehameha the Great. Check conditions in the area before venturing. The access road is unpaved. When it's dry, it's not bad, but with pooled rainwater, it can be difficult, if not impossible, to traverse. Even with four-wheel drive, you could easily get stuck in the mud.
Off Hwy. 270, turn at sign for Upolu Airport, near Hawi, and hike or drive 1½ miles southwest, North Kohala, Hawaii, 96719, United States