One of the two cities, now called Ciudad Blanca 1, had been detected a year ago, but in recent days the scientists identified the ruins of a neighboring city.
Together, the two would triple the size of Copan Ruins, the most important legacy of the Mayans known in Honduras.
Helkins Steve, one of the American scientists involved in the detection of these new sites, explained that the archaeological findings open the possibility of scientific investigations which would be "the discovery of the century" in this Central American country.