Today we visited several archeological sites, the Calahorra Tower and the Alcazar.
There are so many layers of civilizations; Roman, Visigothic (Germanic tribes invading then converting to early Christianity), Arabic and the Berber Muslim Caliphate, Jews then Christians and now modern Cordoba.
At one point Cordoba was the largest, most educated city in Western Europe. The huge population was possible with agriculture using the mechanical lifting of water from the river. This technology, along with astronomy, medicine and much more, was brought by Muslims.