Good Night Boston
I'm not sure how old your kids are, but there's a series of board books called "Good Night Our World." Each book features a different geographic place, and saying Good Night to the high profile or noteworthy sites and landmarks in the area. We have Good Night Seattle and Good Night San Diego. There is one for Boston. They're board books, but our kids love seeing pictures in a story book of places they've been. Our oldest is nearly five and she likes the books way more than the baby.
There's also an alphabet book about Boston called Journey Around Boston from A to Z. This is also part of series based on cities, mostly touristy ones. I think they have one for DC, Cape Cod and Nantucket. They're more about showcasing the cities than the alphabet.
Most bookstores and libraries have a regional section of stuff that's published locally. If you called a bookstore or a library there they'd probably have some really good suggestions.
