One of the things I’ve enjoyed most about writing this series is that it has made Omar and me look at familiar places through a completely different lens. Guanajuato isn’t somewhere we’ve just stumbled across. In fact, I should probably admit from the outset that it has a slight advantage over some of the other places we’ve considered. It’s one of my favorite cities in Mexico. We’ve visited several times over the years, and we’ve even made the j…