You can't travel to the area without pausing to admire Escultura a los Comuneros. This famous artwork is on most people's sightseeing list.
If you like the word "free" as much as most do, you'll be pleased to know this work of art is exactly that. Escultura a los Comuneros is located in Palencia. If you want to keep your itinerary full while you're in the area, also stop by Cristo del Otero, Palencia Cathedral and Plaza de Toros.