We recently took down all the letters that my son had made off of our wall. He was worried that he would forget his alphabet, so we made a new one. I drew out all the letters and he traced them. I also put up a map of the United States and a map of the world. They are actually place mats that I found for super cheap at Goodwill.
My son likes to find the state we live in as well as his grandmas. He knows a few different countries, too. We ate at an Indian restaurant the other night, so we had to point out where India is. I'll need to figure out some more fun activities to do to learn about different countries and states this summer.