This site was added to the tentative a short time before I was supposed to be in Barcelona. I drove to Terrassa before heading into town (yes, I drove into Barcelona and even parked free and safely outside my apartment ;) I did actually book a place to park nearby which I still highly recommend, parking in general looks like a *****). I arrived a bit early not knowing the opening hours and had to wait around, but eventually the ticket office sold me a ticket and I was allowed to go inside ten minutes early. First you see the "museum" part with glass walks. Nothing is really great here. The main attraction is outside.
Three churches are outside, but these aren't actually the original churches. The pamphlet explains it nicely that there are several layers of church history built upon it, almost like the city of Troy just no mythical wooden horse. So of course my first question is what they are really inscribing here, as the old section is buried under others, but the title clearly points out the "5th-8th centuries" decorations which aren't anything special to me - surely they can be unique as the document state. You can see sections of it, with some under glass panels at the museum. The current churches are from the 11th and 12th century.
The first two churches offer very little to see, and the only large one, San Pedro, is still used a regular church. The documents point to "unique" 11 times. I have more of a feeling this is a niche that merges several styles across Europe which makes it seem unique. Excuse my layman's terms.
p.s. sorry I couldn't find my pictures for this, maybe I actually did not take any :o I wouldn't be surprised, or it's not allowed, I forget.