León

In León province:

Astorga

Ponferrada

Villafranca del Bierzo

San Miguel de la Escalada, 10th century monastry

Sahagún 15th century churches

Grajal de Campos: Medieval castle, church and palace

Valdevimbre (http://es.wikipedia.org/w...)

Outside León province:

Zamora

Oviedo

Salamanca