Old cathedral and roman bridge, Cordoba, Andalusia, Spain. Cordoba was the most populous city in the world, and under the rule of Caliph Al Hakam II | 24 Reasons Why Spain Must Be on Your Bucket List. Amazing no. #10
As you drive along this ancient Roman bridge into Cordoba, Spain, you become enthralled with this historic city. Once the world's greatest examples of how the people and scholars of the religions of Christianity, Judaism and Islam lived in harmony.