I would recommend going to Santiago de Compostela in Galicia. while there are other impressive sights to see in Northern Spain, I think that Santiago is the most impressive if you like history. If you are interested in viewing medieval and renaissance structures embedded in historical significance, Santiago is it!

Within easy reach of the Rias Baixas, the coast is less than an hour away by car or train.

Buen Viaje! wink
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The world is a book, and those who do not travel read only a page.
--St. Augustine (354-430)