Dear future Barcelona visitor person. I have some unsolicited advice for you. No, not how to save 10% on your car rental (why would you rent a car in Barcelona?). Nor is it how to find the sangria with the most cherries in. This advice is for your feelings and stuff.
Barcelona is not your typical tourist destination. There’s a certain something going on underneath the surface there. Consider it my self appointed community service to give you the heads up. For your own good, of course.