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Mansion built in 1883 for a banker, and used as a summer residence by Franco, this is now a museum of Spanish literature.
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Former church built circa 1300 and now a museum exhibiting old altars.
Founded in 1187 and still an active Cistercian convent, with some three dozen nuns. "Huelga" in this context means "on fallow land": it governed 50 nearby villages, and was a royal burial place and wedding venue. Visit by one-hour guided tour.
Story of human evolution, centred on findings in the hills of Atapuerca 16 km east where four hominid species dwelt, going back 800,000 years. Excavations continue at Atapuerca but there's not much to see there. The museum was built in 2010 on a gap site, formerly a Dominican convent.
Ornate Carthusian monastery, built as a palace in 1401 then converted, and re-built after a fire in 1452. It's still active.