Spot the museum

This is the Byzantine Walls Museum in Cartagena. It's a small, unremarkable place but I've been in much worse. It has an impresive facade don't you think? Not at all easy to confuse with a slightly run down block of flats.

Do you see the sign that says museum or the board with the opening times? No, neither do I.

It could have closed down of course. I haven't tried to visit it recently but, then again, it always was a discrete little spot