Almanzor before the castle of Alba Historical milestone · La Robla, La Montaña de Luna, León Image of La Robla, not of the place itself. In 997 the fortress of Alba, in La Robla, withstood the attack of Almanzor's troops and, together with the sister castles of Luna, Gordón and Arbolio, kept closed the mountain passes giving access to Asturias. 997 Photo: Savh (CC BY-SA 4.0) What to see and do in La Robla