Very cool. I'd never heard of the place.
So I was reading a novel and it had a good part set in Nan Madol.
Here is a map from Wikipedia:
Some good inspiration there...The site core with its stone walls encloses an area approximately 1.5 km long by 0.5 km wide and it contains nearly 100 artificial islets—stone and coral fill platforms—bordered by tidal canals.
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Nor I, but sure is interesting
Were you reading The Moon Pool, by any chance?