The Mysterious Cities of Gold is joint French / Japanese television series made in the early 1980's.  The story is about three children, Esteban, Zia and Tao, who are accompanied by the spanish navigator Mendoza and two sailors Sancho and Pedro.  All of them are looking for the legendary golden cities for different reasons.
 
The search leads them to South America and many dangerous adventures, through harsh terrains, and they get to meet various tribes and people.
 

 
 

Various characters, vehicles and items:
Esteban, Tao, the Doctor, Marinche, the Golden Condor, a City of Gold and the Jade Mask, a Sun Medallion is also blended in.

Info about The Mysterious Cities of Gold

MCoG is using many real life locations and historic facts, there are a few futuristic parts which help making the series as good as it is.  Many episodes have a documentary at the end, depending on what was shown in the current episode.  Some documentaries have been cut away for various reasons.

What also set MCoG apart from other series, was the continuing storyline that went throughout the entire series, and the artwork.  Mysterious Cities of Gold was dubbed into various different languages, among them are: French, English, Swedish, German, Polish, Japanese, and possibly others.

The Mysterious Cities of Gold was created by Animation Production PIERROT in japan.
 

The series is available on pre-order at Amazon.com and was released in the UK by HMV.  The also seems to be an Autralian puplication available.