Cordoba

While Paris had a population of 30,000, Cordoba (accent on the first syllable) was a thriving city of over 100,000 Muslims, Jews and Christians living harmoniously. They had over 70 libraries and on the streets you could hear Greek, Latin, Arabic and Hebrew. In its time, Cordoba was comparable to Baghdad and Constantinople. I loved learning that "Al-gebra" was their system of mathematics. The ghosts of such scholarship and "patrimonia de humanity's" are still wandering the narrow streets. Probably not getting quite as lost as we did.