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Concierge.com's insider take:
First built in A.D. 913, this fortress was expanded and rebuilt countless times by successive Muslim rulers. In the 14th century, Catholic kings took it over and further embellished it. The Alcázar is a succession of courtyards, tiled arbors, enclosed gardens, and halls with lacy stucco friezes adorned with Arabic inscriptions. The Spanish royal family still uses it as their pad on visits to Seville (making it the oldest royal residence in Europe still in use).