tsubaki
Player Valuation: £90m
Apparently, the Alhambra and similarly popular sites get booked up well in advance. Don't know this for sure but it might be worth checking to avoid disappointment?
In Seville, the Cathedral is worth queuing for just for the views from the top of the tower alone. There are a number of other things to see in there as well. The queue for the alcazar is also worth it. Like most Spanish cities you can spend several days wandering round the old town regions, discovering something new every day ...
Having just come back from this, can heartily endorse this post. I did love the Alhambra and managed to get tickets before I went (though not for the Nasrid Palaces as there werent any available).