Great idea for traveling or road trips. Get a big map of the US, and take a picture when you visit a new state. Cut the picture out in the shape of the state, and glue to the map! I'm definitely doing this!
From HA: Travel Memories Map. Draw a map on a cork notice board. Resize Alaska and Hawaii to fit. Print a photo for each state and cut to shape with a craft knife. Attach to board with pins or sticky dots.