Someone I follow on Twitter mentioned that they were reading All-Star Superman to their children and shared a few of their favorite pages. All-Star Superman is probably the best 21st Century story featuring the Man of Steel. Grant Morrison and Frank Quitely perfectly capture what makes the character so wonderful in a way that feels both timeless and fresh. It's the first Superman story that I recommend to others.
One of the favorite pages tweeted this guy tweeted is one of the most famous in the series. Seeing it again struck a deep chord within me. In the context of the story, Superman finds out that he has only one year to live and spends the series trying to do as much good as possible. There is one issue that covers him saving people around Metropolis on one of his last days. Superman stops disasters, he comes up with a Kryptonian treatment for cancer and takes it to a children's hospital, he saves lives.
In the midst of all this superheroing, there's a panel showing a young girl standing on top of a skyscraper.