Sometimes my Clients expect me to have X-ray vision to see behind things, and I always have to tell them that I don't. It's the only time they are disappointed in me.
I warn them that there could be some damage behind pictures, under carpets, behind locked doors, etc.
This first picture was in the very large home gym in a property owned by a professional football player:

I jokingly warned my Clients that visitors to the gym who did not meet their weightlifting goals for the day got to take out their frustration on the wall, and when the damage got so bad, they simply started stacking beer cans against the wall.
I got a call from my Clients at the final walk-through telling me that my joke was not so funny because that's exactly what they found, a wall full of holes. Escrow got delayed for a week while the Seller and Buyer argued over who had caused the damage and who was going to repair it.
The following picture shows a collection of Hot Wheels, still in their original packaging and proudly displayed on the wall. In this property, there was a huge moisture stain on the wall resulting from a leak in the plumbing upstairs.

And lastly, in the following picture, I got dizzy, but there were a lot of cracks in the lathe-and-plaster wall which needed to be looked at in more detail to determine the cause, whether the cause was serious, and whether or not the cause was still active.

As much as home inspectors would like to be able to see everything, it's just not possible. So listen to him when he warns you about areas that are not visible or not accessible and make sure that you look at those areas during your final walk-through. Remember to take a copy of your home inspection report with you as a friendly reminder. You want to make sure that you're 100% happy with the property and that all the potential headaches are either taken care of or are headaches that you can accept.
♫♫☼☼♪♪☼☼♫♫

2 Comments on Be sure to hire a home inspector with x-ray vision, and it's not me!
There is a company out there that does this. It's run by DC Comics and the owner is Clark Kent. Wasn't able to get you a phone number though ;-)
Hi-res infrared cameras will look thru the wall. We can see a person standing on the other side, including everything inside the wall. Mold, termites, plumbing leaks, you name it. Always insist on infrared.