• Brief description: The building has served different purposes over the course of its existence. During Roman times, it was a fortress, during the Muslim occupation it was part of the caliph's palace, and after the Christian conquest it became the royal residence. After that it was the headquarters of the Catholic Monarchs before finally being ceded to the Inquisition Tribunal. Its gardens are particularly impressive; though don't miss the exhibition of Roman mosaic tiles (on display in the conference room) discovered during the excavation of Plaza Corredora. 
• Cost: 4.5€ (8.30-9.30, free).
• Length of visit: 1 hour.
• Hours: Monday from 8.30 to 20.00. Tuesday-Friday from 8:30 to 20:45. Saturday from 08.30 to 16.30. Sunday and holidays, from 08.30 to 14.30.
• How to get there: walking. It's on Avenida del Alcázar.