If you're looking for used books in English, go to Under The Volcano Books. It's on the second…read morefloor of the American Legion building. When we walked up on a Monday, a sign told us to yell "books." Within a minute, someone unlocked the gate and led us to a cramped room that feels like your grandma's attic. Books are organized by topic and piled high on shelves. Writing for travel sections at newspapers, I enjoyed their more local guides to Mexico City.