One of my classical projects now in a slightly different packaging. Now supports both States and Countries.
I built this new type of programmable spreadsheet and it turns out it is a great platform for something like visited countries. It is more flexible than the app below and when you are done you don't just have a pretty map, you also have a list of all the countries you have visited. You can also add notes to each country, which will show on mouse over on the map. It's just better! Also the map is bigger and more up-to-date. If you know a bit of Python you can change colors, the projection etc. Also still a bit of a work in progress, but it would mean a lot to me if you would give it a try.
below the old version:
Maps are available for the following regions:
The United States
Simply select in the table below the countries you have been to and copy the html code below.