Disease maps that trace the incidence of West Nile virus, encephalitis and dengue fever across the United States and its territories demonstrate one of the many uses of geography.

Learn unique facts about each American state. You can also read a more in-depth history of each state, watch videos and play a game about all the states.

Part of the Golden Gate National Recreational Area, Alcatraz Island is located in the San Francisco Bay. Originally a lighthouse and military fort, the island is best known for being a federal prison. The island is packed full of...