National Geographic Explorer and scientist Albert Lin travels to Colombia to learn the truth behind the legends of El Dorado. While exploring the lost city of Ciudad Perdida, Lin discovers that fact is far more exciting than fiction - and discovers not just a city but an entire civilization. Now, for the first time, Lin reveals the extent of this civilization and its "cities in the clouds."

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