Explore one of Spain’s best kept secrets on this multi-day journey through the North. Private, full-service bus tours include guided visits to San Sebastian, Bilbao, Santander, Santillana, Covadonga, Oviedo, and Salamanca. Tick off the region’s highlights, from centuries-old historic centers to the cutting-edge Guggenheim Museum. But there’s no rush: you’ll have plenty of free time to wander at your own pace.