David Rumsey Collection: Thousands of high-resolution digital images of maps from the David Rumsey Collection, one of the largest private collections of historic maps in the US. Focus is 18th and 19th c. North and South America cartographic materials

Google Maps: Provides directions, interactive maps, and satellite/aerial imagery of many countries. Can also search by keyword such as type of business

OpenStreetMap: The Free Wiki World Map – An openly licensed map of the world being created by volunteers using local knowledge, GPS tracks and donated sources. Includes an interactive map and details of how to get involved