The original Wal-Mart store in Bentonville now serves as shrine and museum to the local Five-and-Dime that went on to become the world's largest company. While there's a lot to look at (founder Sam Walton's original office recreated nail-by-nail, hundreds of magazine covers, The Presidential Medal of Freedom, Sam's 1979 F100 Ford pickup... that sort of thing), I was hoping for more info graphics.
About the only I could find were this series of maps showing the growth of the chain from 1945-1989. Crappy as my phone photos are, the pictures are worth a thousand stores: impressive to many, scary to others.
Actually, today there are nearly 4,000 stores. I'll see what I can dig up by way of a more recent map.