Madinat Al-Zahra (also spelled Medina Azahara & Medina Al-Zahara) is a great site and highly recommended for anyone in the Cordoba area. It is the ruins of a 10th century city which was sacked and then history left behind. It is a few miles outside of Cordoba, so you will need a car or taxi to get there but my family thought it was worth the trip.
I've attached some pictures (and there are a zillion on elsewhere, of course) so you can see some of the ruins that are left behind. Since they are ruins, and it was so thoroughly destroyed that there was nothing left of material value, you need to use your imagination a little to see what once was. This city was purposely built over 1000 years ago and was once the capital of the richest and most powerful city in Europe. (some parts of the city even had running water) I've read that they've only uncovered 10% of the site, so hopefully more good stuff awaits us.
As is, it is a fantastic site, and amazing to think what once was.
If you do plan to visit, you should plan for at least 2hrs not including any time spent at the museum.
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