The fundamental problem is that Infrared Italy is alliterative, and Infrared Barcelona is not, and if it comes to a choice between something that is pleasing and something that is true, I pick the former. Here's some more of Barcelona - and also Montserrat, which is in Barcelona province - shot with my infrared camera.
There aren't any alliterative synonyms for infrared. I could have tried Beautiful Barcelona but that doesn't explain the fact that these photographs were taken with an infrared camera.
Barcelona: Beyond Black might have worked, but people would wonder why I was talking about black in a post about infra-red.
Barcelona Bang Bang Boogaloo is catchy but doesn't make sense. That doesn't mean it's bad; a lot of things don't make sense.