Don't know of any old junk yards that will just let a group of people wander around in.
But!
There is a used equipment sales place I have been wanting to stop at.
It's has a lot of cool looking, aged road tractors, earth moving stuff and farm equipment.
Not even out of your way.
When you leave Dad's Cafe, turn west on the outter road, it's about 2-1/2 miles and sets between the outer road and I-70.
Another mile west and you can jump back on I-70 at Danville, Mo.
Check out Google satilite, they have a lot more stuff now.
Don
