The Disappearing Folder

So today a buddy of mine was messing around on his computer. He right clicked on a folder he had just created and went to properties where he noticed a little button that says "hidden." So he decides to click on the little box and click apply. On returning to the screen he realizes that his folder is gone. Where did it go? He didn't know, nor do I, we searched his computer and couldn't find it anywhwere. So the moral of the story is don't make your folders hidden unless you know where they go or you don't want to find them again. If you know how to find them, please let me know. Thanks! Off to bed!