In a remote region of the western Pacific, just north of the equator, lies the ruins of the ancient and enigmatic city of Nan Madol. The magnificent ruin, built in a lagoon on the east side of Micronesian island Pohnpei, consists of 92 artificial islets constructed on coral reefs which are linked by a network of canals, giving it the nickname Venice of the Pacific.
Nan Madol is an engineering wonder, with massive basalt walls reaching 16 meters high in some places. Carbon dating indicates the structures are around 900 years old, but the islets themselves date even further back to the 8th and 9th centuries AD. The basalt stones originated on the opposite side of Pohnpei from a volcanic plug, where magma had hardened within the vent of an active volcano. What has modern archeologists mystified is how these massive stones were moved from one side of Pohnpei to the other using what primitive technology would have been available at the time. Furthermore, once the basalt had been successfully transported, it would have then been hoisted to heights of 16 meters. The effort required to build the megalithic structures would have rivaled that of the Egyptian pyramids, with a total area of 75 hectares, and an estimated total weight of 750,000 metric tons.