They're self-made. I took a few WIP pics of the construction so I can possibly post a how-to at some point.
Please do! Always looking for new ideas for stone walls and such, and yours do look good.
Those really look like some high status Hawaiian (Ali'i) compounds that I worked on at Honaunau on the Big Island a few years back. Right down to the petroglyphs.
Not my work, they're Dolmot's, I just quoted his photo in my reply. Although I agree, they do remind me of the Hawaiian temple we visited in Oahu last year.