How do I display the last modified date of published pages in dashboard?

On many occasions, I have found myself opening page after page on a WordPress site to determine whether it has been recently updated or not. While WordPress displays "last modified" dates for draft pages, once published a page only shows its published date, regardless of what updates might be made to the page after publication.

Is there a plugin available that will add the last modified date to the Pages dashboard screen, or give more options for what the Date column displays?