Yes I'll be praying for him. Sounds to me like a couple of things might be going on here. For one, he seems delusional, imaging things that aren't real; and second, he sounds like someone who is crying out for attention. It can be very difficult being a friend to someone like this because it's exhausting; but that's probably what he needs most. Maybe you could just talk to him when he brings up this stuff and get him to open up more. If he finds some friends he can trust that would probably be a big help.
As far as the farm, that's easily explainable: He may have been there before without telling you; someone may have told him about it; or, more probable, he saw pictures of it online.