Hi,
Barcelona is a fantastic, vibrant city. I was there a few months ago and there are photographic opportunities at every turn. Look up, down (previous post), everywhere.
Like the previous post suggested walk Las Ramblas...at the top of it is Placa Catalunya. You might take the Bus Turistic (located across from the Placa Catalunya in front of the department store El Cortes Ingles) to the Sagrada Familia Cathedral and Parc Guell to see work by Gaudi.
Hope you have a great time.
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