they built a city out of basalt logs ON a reef in the Pacific (Nan Madol)

file under: how is this not famous. Nan Madol, off Pohnpei in Micronesia. somebody built over 90 artificial islets in a lagoon on top of a coral reef, linked by canals, walls over 7m high in places, and the building material is these long prism shaped basalt columns stacked log-cabin style. no morta……