Yes, it's in all the guide books but the Alcazar is easily missed. From the outside it doesn't look anything special but inside it's magical and a lot less frantic than the Alhambra. If you visit make sure you spend some time in the gardens. If you only have an afternoon in Seville and have to choose between the Cathedral and the Alcazar then give the Cathedral a miss.
Plaza del Triunfo; tel: 954 502 323