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This is one of the most representative buildings in the entire region and part of the old medieval castle that sheltered monarchs such as Queen Urraca. Declared a Site of Cultural Interest in 1949, its interior still features a curious double-ramp spiral staircase, a unique example in Spain, which connects its two spacious vaulted rooms. Since 2019, it has housed the Condado do Tea Wine Science Museum.
It is highly educational; through touchscreens, videos, and games, visitors can learn, while having fun, about the different stages of work carried out, both in the vineyard and in the winery, to obtain the region's characteristic and renowned wines: white, red, and sparkling.