Look for the tiles in the streets and on walls with "chai" and menorahs and more. The streets are so narrow and it's like a maze but there are signs of Jews having lived there throughout the area. Our private tour guide gave us so much information about the history of Jews in Spain. According to him, they lived together with Christians and Moors for about 1500 years. But starting in the 1300s, things became bad for the Jews.
If you are interested in Jewish world history, this should definitely be on your list!!