The Seven Cities of Gold

The player takes the role of a late 15th-century explorer for the Spanish Empire, setting sail to the New World in order to explore the map and interact with the natives in order to win gold and please the Spanish court. The name derives from the "seven cities" of Quivira and Cíbola that were said to be located somewhere in the Southwest United States. It is considered to be one of the earliest open world video games. (wikipedia.org)