A must visit
It would be a crime to go to Valladolid without visiting the Patio Herreriano. It's located in one of the cloisters of the Monastery of San Benito el Real, made by Juan de Ribero Rada, in the Renaissance style. The Herreriano Patio is a Spanish Contemporary Art Museum, with a collection that goes from the year 1918 to the present day. Their hours are: Tuesday to Friday from 11:00 to 20:00 hours and Saturdays from 10:00 to 20:00, Sundays from 10:00 to 15:00 hours. It's closed on Mondays, Christmas Day, and new Year's Day. It costs 3 euros, or 1 euro for concessions.