Just behind the buildings on your left lies El Call, the medieval Jewish Quarter. In the thirteenth century, this was a thriving hub of scientists, doctors, and philosophers, representing about 15 percent of the city's population. Interestingly, the nearby Church of Saint James—or Sant Jaume—actually stands on the site of what was once a synagogue before being converted in 1394 following a period of great religious tension. If you wander into the smaller streets like Carrer de Marlet, you might still find ancient Hebrew inscriptions carved into the stones. For a practical perspective, if you wish to see the remains of the Ancient Synagogue—one of the oldest in Europe—it is only a three-minute walk from where you are now, tucked away in the narrow alleyways that have remained largely unchanged for 700 years.