North-eastern Spain; places to visit ?

Hi forum-readers,

In two weeks I will be going to Spain (again). This time northern Spain; the Barcelona and Zaragoza-area.

Any recommendations for places to be visited during the weekend; warbirds, classics, wreck and relics ? No spare-time during the week, so all military will be a “no go”.

All help very much appreciated.

Regards,

Benno