Boston's bookstores

I can hate cities. I can be bored with them. But there are places that even in the worst city are still magical to me - bookstores. I came across two of such places in North End of Boston. One was open-air bookstore and the other one was around-the-corner. From the outside not very interesting, but inside they had plenty of books, old, new, in many languages... I could spend hours there...