Every trip has its favorite moment. On a recent vacation to Spain, mine was the afternoon Charles and I spent in Granada touring the Alhambra. The day began in Málaga, our base for four nights, where we got an earlyish start to make the 80-mile journey to Granada in our rental car. We took the coastal route along the A-7, Spain’s meticulously maintained Mediterranean corniche. It was a gorgeous spring day, with a cloudless sky and a beaming sun blanketing…