The castle in Alcañiz was once the center of the Spanish kingdom. King Ferdinand II (of Aragon) and Queen Isabella I (of Castille) were married, setting the stage for the unification of Spain. When we visited Alcañiz on a roadtrip from Barcelona to Madrid, we stayed in the castle through Spain's excellence Paradores program. Under the program, Spain turns historic castles, monasteries and other important historic buildings into hotels, ensuring they are properly maintained for future generations. There was only one other couple in the entire castle when we visited and it was the most affordable place we stayed in during the entire trip. If you are planning a trip to Spain, I highly recommend you check out the Paradores.