El Dorado City of Gold

S1, E3: National Geographic explorer and scientist Albert Lin travels to Colombia, South America, to find out the truth behind the legends of El Dorado. Exploring the lost city of Cuidad Perdida, Albert discovers that the truth is far more exciting – and discovers not just a city, but an entire civilization. Now, for the first time, Albert reveals the extent of this civilization and its 'cities in the clouds.'