This is pretty much a child adventure, but many adults will also enjoy it. Kids, you need to arrange that Mom or Dad will be able to drive you around, without getting lost. Pack a picnic, and take your camera with.
1
Clues to old barns will not be found close to main roads, so, your driver will have to leave the main road, and travel along the smaller country roads.
2
Look out for area where there are thick hedges alongside the road, or neglected fences.
3
When you find this, slow down, and look for an entrance.
4
If the entrance or gate also looks scruffy, go in. You will need to look out very carefully, as very often old buildings blend into the surroundings.
5
When you find one, look out for a house close by, so that you can ask for permission to be on the property, and to take photographs.