This 15th-century Gothic church has the evocative atmosphere of a mini cathedral. It is home to Spain's oldest still-functioning church organ and has a gloriously ostentatious altar, fronted by several Roman stone tombs, plus that of Fernán González, the 10th-century founder of Castilla. Don't miss the graceful cloisters and the sacristia with its vibrant 15th-century paintings by Van Eyck and tryptic Adoracion de los Magis .
