I started collecting the children's book series Good Night Our World for my nieces during my travels around the country.
I didn't think again about the series again until I found a copy of Good Night Washington, DC at a museum in Washington last June. On my next visit home to Michigan, I delivered it to my girls.
Now three books into the series, I've decided to check for a Good Night book in whatever local booksellers I come across in my travels. While in Portland a couple weeks ago, we stopped by a Powell's on Hawthorne. I headed over to the children's section and found Good Night Oregon. Perfect! I bought it, and when I got home, I mailed to my girls.
I have a couple years yet before my girls get too big for these little books so I decided I should check to see what other cities and states in the series might be added to the collection: http://www.goodnightourworld.com/. I see Tennessee, Charleston, Atlanta, Chicago and Arizona, and hopefully, Boston and Los Angeles, in our future at least.