11km/7mi southwest of Valladolid, above the little town of Simancas (alt. 725m/2,379ft) on the Río Pisuerga, is the formidable Castillo de Simancas, in which Charles V installed the Spanish national archives (more than 30million documents, housed in 52 rooms). 19km/12mi beyond Simancas on N 620 is Tordesillas.

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