Lovely and interesting historical site. However various aspects of the organisation are ridiculous. You can get audio guides - some may have sufficient battery - mine ran out in the first 20 minutes. Even if the audio guides stay the course you will find no numbers linking the audio guide to sites of interest in the Mezquita- you will have to guess where you are and it is not easy! This is a large place to find your way around. Visitors are issued with a paper map with the numbers printed on that but the positions on the map do not correspond exactly with the positions inside. How difficult would it be really to put 25 discreet numbered markers around this monument?
If you want to go up the tower you’ll have to check the times. When it says it is open until 1330 this does not mean that you can go in until 1330, it means you have to leave by then which means you have to go in by 1300. I think this may make logical sense to the Spanish visitors but it is confusing for others. More