So you know about Las Ramblas. You know that your football crazy friend will want to visit the Nou Camp. And you know that the Gothic Quarter is where you'll get all the best Instamgram pics, but where in Barcelona are you missing out on? What gems do you need to know about and where you should be staying instead of a cramped room on AirBnb? If you love ice cream, eating, cold drinks and a walk through history, put this list on your itinerary.