How can a user view a list of "on hold" or closed questions? Does this action require some kind of privilege or special trick?
Anyone can view questions that are on hold (which simply means the question has been recently closed). You can search for them using
closed:1. That will show you all questions that are either closed or on hold, and you can sort by "newest", if you are specifically looking for the more recent ones.
Note that some questions are deleted soon after being closed, and viewing deleted questions requires 10k reputation.