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This article contains spoilers about the game, please read with caution.
El Dorado is a world that contains a lost city of solid gold.
"This is a wondrous place, ancient beyond reckoning. The ancient empires of Krokotopia and Old Azteca are but hazy shadows and dim echoes of the wondrous civilization that thrived here eons ago. I have found carvings here that confirm your suspicions that the vanished masters of El Dorado were closely linked to the enlightened builders of Celestia, and that much knowledge and commerce passed between them." -Marco Pollo, Secret Message to Merle Ambrose
In Marco Pollo's letter to Merle Ambrose, headmaster of Ravenwood in Wizard City, he states that the masters of El Dorado were allies with the builders of Celestia and even linked. In his letter, he recalled haunting details: "El Dorado is far more and far less than a city of gold. This glittering isle is a tomb, last resting place of the wondrous masters who built it so long ago, cast down by their greatest achievement. Something terrible happened here, my friend, long ago. I have not discovered precisely what, but I grow troubled. What we found here nearly killed us all."
It is implied that the sentinels turned on their masters, taking over the city and destroying them in the process. "After the fall of this great city, the Celestians used their magic to unmoor the Stormgate from the fabric of the Spiral, to prevent anyone from ever coming here again." The Celestians seemed to think that the sentinels were a great threat to the Spiral, and so they decided to hide El Dorado as best as possible. Interestingly, it seems as if Kane is repeating (history) what the sentinels did: destroying his creator and taking control.
Captain Avery mentions that "you can't just sail to it", as it doesn't always appear in the same place and the Stormgate to there doesn't stay open very long. Anyone who tried to sail there would most likely not return. Marco Pollo, however, somehow found out a way to make a map to it and discovered it. Marco Pollo and his crew visited the lost city once, only to be attacked by golden sentinels and have more than half of his crew decimated. Only a handful of survivors escaped. Gazpaccio mentions that he was the one who took the picture of Marco Pollo and the remnants of his crew.
Once Marco Pollo returned to Valencia, he destroyed the map, and hid the shredded pieces throughout the Spiral. By the time of the events of Pirate101, the player must find all of the pieces of Marco Pollo's map and go to El Dorado. Unfortunately, the Armada holds some of the pieces of the map, so you will have to get the pieces from them first.