On the right is Etal Castle, not a great picture but it's all I could find without going through the photo boxes. Etal itself is a picture postcard pretty village worth a visit if you're ever in the vicinity
Alnwick Castle - is it the most famous of the Northumbrian castles? It appears in the Harry Potter films and probably loads of other films and TV stuff too for all I know.
What I DO know is that we've failed miserably every time we've tried to get in there for one reason or another, so it's still on the "to-do" list.
Belsay (pron Bel-sa) is a lovely castle in the grounds of Belsay Hall - a wonderful place to visit, with fantastic gardens to wander through on the way to the castle. We were there in the Springtime - you can see all the snowdrops in the grass if you look closely.