Zaragoza and "Fiesta el Pilar"
I came up to Zaragoza a couple of random times. But the most memorable was a long weekend (from Tarragona) to celebrate the Pilar festival. I wound up staying for three days, sleeping little, walking the city during the day and enjoying the festivities all night...
Zaragoza is a large city, near 800,000 people. It is rich with old architecture and history. There are ample tourist information booths in the city, near Pl el Pilar and Pl. Espana. You can easily get maps of the city, as well as information on museums, churches, etc.
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Zaragoza - Basilica de Nuestra Senora del Pilar
The towers of the Basilica