Quite interesting - Mayan day/nights and earth periods

[unity100]

And it seems the search for "El Dorado" was part of the spanish going to south america. Maps were available at that time...even many thousands of years earth was known to be a sphere. Even Plato knew of Atlantis.
So information was available at the time of Columbus.

But then, it seems those cities were never found by europeans.

spanish heard el dorado when they landed in mainland america.