It's really worth a visit, as it offers a great historical and cultural holiday.
Next time I go there for a visit, I'll try not to make it in the summer, as it can be a bit hot, maybe spring is the nicest.
Cordoba had the larget library in Europe with more than half a million books and references, and was described as follows:
"When Cordoba was at the height of its flowering (Ninth and Tenth Century) there were over 200,000 houses in the city along with six hundred mosques, nine hundred public baths, fifty hospitals and several large markets which catered for all branches of trade and commerce, including 15,000 weavers:
You could walk through her streets for ten miles in one direction at night, and always have the light of lamps to guide your way. Seven hundred years later this would still be an innovation in London or Paris, as would paved streets.
http://www.cyberistan.org/islamic/qurtuba.html