The Castillo de Loarre is on of the gems of the Romanesque and is sited tantalisingly close to the Camino Catalan between Bolea and Sarsamacuello near the town of Loarre. I reckon it is possible to walk up to it and carry on in one day. Wikiloc, All trails etc show trails and I could probably just walk up the A2223. But I would like to hear from anyone who has done it and how.