Real Alcázar de Sevilla
You don't really notice the vibrant beauty of the Royal Alcázar of Seville when you first walk up to it. Thick walls and high towers guard the splendours of this royal palace complex dating back to the days of the Muslim rule over the Iberian peninsula, though most of its beautiful rooms were actually built - by Moorish workmen - for the Christian King, Pedro the Cruel of Castile, in the 1360's. Still, the style of the palace is heavily influenced by the Muslim rule of Spain that lasted from the conquest in 711 until 1492, when Granada was recaptured by Christian forces.
Good to know:
The Real Alcázar de Sevilla is open between April and September from 9.30am to 7pm, they close two hours earlier in the winter. The palace is closed on January 1 and 6, Good Friday and December 25. Admission per adult is 9,50 euros. I did not purchase a ticket before visiting and the waiting time wasn't more than ten or 15 minutes. However when I passed the next day, the queue was much longer - so it is probably not a bad idea to buy a ticket online as you can thus jump the queue. For more information, have a look here.