University of Texas at Austin
University of Texas: Exploration and Settlement Before 1675
A great map showing the explorations of Spanish, French, and English explorers in North America between 1530 and 1675. A detailed key identifies each explorer and route. From the Perry-Castaneda Collection
Other
American Journeys: Map of the Spanish Entrada Into North America [Pdf]
Map showing the routes taken by fourteen Spanish explorers in the Americas between 1509 and 1543.