The Alcázar is an improved Fort, providing Culture in addition to its defensive bonuses. Non-aggressive players who are aiming for a Culture Victory will find it particularly useful after researching Flight, as it will provide them with extra Tourism while making their lands easier to defend. Furthermore, with its bonus yield to Science in Gathering Storm, players have an incentive to build the Eiffel Tower for more useful Alcázars.
The alcázars (a sort of final refuge) were castle-palaces built in many of the Moorish cities in al-Andalus, mostly between the 8th and 15th centuries AD. Many of these were built as the residence of the Moorish governors … and came in quite handy, not only against unruly rivals but also later against that perplexing Christian Reconquista. Many still stand, and are quite famous: for instance, those in Segovia. Toledo, Cordoba (the famed Alcázar de los Reyes Cristianos), Burgos, and Seville. The last, as an example, was built in 913 as a fort for the Cordoban governor; in the 11th Century, it was expanded into the palace known as al-Muwarak (“the Blessed”). The Christian king Fernando III made it his royal residence when he captured Seville in 1248. Now it is just another stop for tour buses in the city.
Even Our Castles Have Castles
Build an Alcazar within 2 tiles of the Alhambra