The Mezquita Mosque in Cordoba

My brother is very interested in the way Islamic population managed to adapt to other cultures, so, when he visited Cordoba for the first time, he went directly to Mezquita, a very famous Islamic mosque. He told me he entered an arcaded courtyard with orange trees and fountains which is called Patio de los Naranjos. He liked the interior of the mosque very much because of its great granite and marble columns.
What I know for sure is they're open 'till 5.30pm (my brother wanted to stay longer and they told him they were closing). A ticket is 8 euros.