What 5,700 years of sea-level changes reveal about early humans
Much like island nations today, large stone walls may have been constructed to protect the site from waves that were slowly encroaching higher and higher.
| Dec 25, 2022 03:56 AM EST
Created: Dec 25, 2022 03:56 AM EST
Nan Madol prehistoric ruined stone city built of basalt slabs, overgrown with palms in Pohnpei.