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Nuns visit the Mosque-Cathedral of Cordoba on October 14, 2014. Historical treasure and UNESCO World Heritage Site, the Mosque-Cathedral of Cordoba is the subject of a dispute over its ownership. AFP PHOTO/ GERARD JULIEN (Photo credit should read GERARD JULIEN/AFP/Getty Images)

Nuns visit the Mosque-Cathedral of Cordoba on October 14, 2014. Historical treasure and UNESCO World Heritage Site, the Mosque-Cathedral of Cordoba is the subject of a dispute over its ownership.  AFP PHOTO/ GERARD JULIEN        (Photo credit should read GERARD JULIEN/AFP/Getty Images)