Last month when I was in Boston visiting my older daughter, Cynthia, I spent an hour at the recently renovated Brewer Fountain Plaza in the Boston Common. During the lunch hour, a food truck is on site along with live piano music, chess tables and a lending library consisting of several carts full of books and periodicals. The library is staffed by The Friends of the Public Garden.
After I ate my energy bar ( I still honor the days when libraries wouldn't let food near books), I relaxed and thumbed through a hardback copy of Great Civil War Battles and Their Heroes edited by Walton Halls, which is compilation of famous generals of both sides and the battles they fought. It has a lot of Courier and Ives-like sepia toned lithographs artwork reclaimed from a book published in 1891. It's a decent book suitable for browsing, but not buff-worthy.
Atlanta has a similar Outdoor Reading Room at Woodruff Park, which I have not visited, but Baby Got Books has.