Machado Postpiles is something like three million years older than Devils Postpile and therefore geologically significant - if not particularly interesting to look at. Personally I think it's a very large pile of fossilized dinosaur turds - but then I'm not a geologist.

You can read all about it at <This Link > or you can just go up there. It's a great excuse to go for a walk and they have some pretty trees you can look at along the way.