National Geographic Explorer and scientist Albert Lin travels to Micronesia, in the heart of the Pacific Ocean, to uncover the ancient island city of Nan Madol. Exploring the tombs, temples and ritual sites, all built on man-made islands now shrouded by centuries of jungle growth, Lin discovers not just a city but an entire ocean continent spanning thousands of miles.

Originally released by National Geographic, 2019. Streaming video file encoded with permission for digital streaming by Infobase on January 05, 2023.