I've just finshed reading Framed by Frank Cottrell Boyce with 8 yr old DS. The story is about a boy in a small town in Wales and what happens when the National Gallery paintings are evacuated to an old slate mine nearby. Over the course of the book it features a dozen different paintings in the story.
So I printed of a map of the national gallery and looked up which rooms they were in on the websited and marked up the map and gave it to DS, and went to the National Gallery to find them.
It worked really well (he probably enjoyed the orienteering around the gallery as much as the paintings)
Anyway I was quite proud of this educational outing and recommend it highly (and also wanted to see if anyone else on here was nerdy enough to have done this).