Albergues with architectural or historical importance.

Try Granon, Tosantos and San Nicolas

Also try the monastery in Samos -you are awakened with music, St Juan de Ortega - both freezing cold in late winter early spring, thank goodness they opened that new albergue in Roncesvalles!, and for fun should you go that way, Domenico Laffi in El Burgo Ranero - an albergue built from mud brick!

the albergue in Bercianos del Real Camino is an old adobe-brick rectory, surrounded by other mud-brick houses and a crumbling church. Most of the buildings in the mid-meseta stretch of the camino are made from adobe -- they´ve just been rendered-over with concrete. (my house included.)

The albergue of San Nicolas, just before Itero de la Vega, is in an old church, no electricity, staffed by devout Italian confraternity members. Very atmospheric!

The Albergue of Jesus and Mary in Pamplona is in an old seminary building with pretty vaulted ceilings. And the (now private) albergue/hosteria of the Madres Benedictinas in Sahagun is in what remains of Spain´s most powerful 11th century monastic house.