Nan Madol is an archeological site in Pohnpei built between the 8th and 11th centuries.

The megalithic architecture consists of large basalt stones. About 40% of the stones have been sourced to come from the north. It is unknown how they were moved and where the rest of the stones come from. The stones create walls the enclose an area about 1.5 by 0.5 kilometers creating nearly 100 artificial islets.

It is unknown how the structures were built. There are theories it is a lost continent, Lemuria or Mu. Others think it was built by Greek sailors. And others think it was aliens.

Pohnpeians think that builders of Leluh archeological site on Kosrae, but radiocarbon dating proves Leluh is newer than Nan Madol. According to Pohnpeian legend, twin sourcers levitated huge stones with the help of a dragon.