I finally edited some of the photos that my wife and I took on our honeymoon to Barcelona. I highly recommend it.
The highlight is most certainly the beautiful modernisme architecture of Gaudi and his contemporaries.
Here is a balcony from a home he designed on La Mansa del Discordia (the block, or apple, of discord). I over-exposed this a bit to make it look spookier, I think it worked.
Here is a view of three of the houses (only one by him)
From Parc Guell (this seating area sits above an arcade, the entrance to which you can see in the second photo)
And finally La Sagrada Familia