These were ancient Hawaiian temples.
Features
Pronounced "hey-ou", a Heiau is quite simply an ancient Hawaiian temple.
They were used for all sorts of things ranging from stopping and starting the rain and treating to the sick to achieving success in war and reaching peace.
Heiaus were made different styles but you often see these as rectangular in shape with walls made out of rock, sometimes will multiple levels that rise up. Many were destroyed years ago and others just fell apart over time or had nature reclaim the land they were on but many are still around.
The biggest known heiau is Pi'ilanihale Heiau / Kahanu Garden, located on the island of Maui. You might also spot some while driving around the islands, look for the brown signs that will let you know when a heiau is nearby.
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