This article could be a great one with information on Barcelona Dungeon and show pictures, give you an address and so on. But, so far there is no such thing as a Barcelona Dungeon, meaning that if you want such a thing to become reality, you better contact Merlin Entertainment for them to create a Dungeon in Barcelona as well.
So far such Dungeons exist in York, Edinburg, Hamburg, Amsterdam and of course, the most famous, in London.
If there should ever open a Barcelona Dungeon, we will of course write about that!