We weren't specifically on the look out for Jewish history but it stood out in many of these places. Our greatest surprise was in the Museu d'historia de la Ciutat in the Roman city. We went underground into the archaeological site and there were bricks with Hebrew writing within the walls. In their gift shop Stephen found a pamphlet called El Call Barcelona's Jewish quarter and on our final day we followed its maps and discovered the former Major Synagogue of Barcelona. What a surprise. Jews have been worshiping here for over 1000 years.
Barcelona is the ultimate vacation destination. Also, we weren't mugged, pick-pocketed or attacked in any way - despite what you hear from the tour books.