My wife pointed me toward a site that allows you (or your students) to populate a map of the United States with information showing the states an individual has visited. The site is called Douwe Osinga's Projects, and the process is really simple - point and click. I filled out mine - not quite sure how I missed travelling to North Dakota - maybe next year. Hummm - perhaps I'll send my daughter to college there - that ought to create a visit!
visited 43 states (86%)
Create your own visited map of The United States
You can also do the same with a map of the world, or of India. A pretty cool site with potential for both personal and classroom use.