Side Note: In order to understand the FULL magnitude of awesomeness of this concluding scene, you literally had to at least watched and payed attention to the entire movie (no bathroom or snack breaks and I mean it) if not watch the first 2 movies previously, in my opinion.
Building up to this scene, Batman was always notorious among the people of Gotham. Although he was the hero that Gotham deserved, Batman was always looked down upon by several in the city, including the police force in which he helped a lot. While nobody put him up to it, Batman felt the need to save the city from its destruction. Bane, the villain, created a bomb of great capabilities, fictionally, that was going to destroy the entire City of Gotham and all its inhabitants.
After endless fight scenes, Batman ( the Dark Knight) truly rises from his previous defeat in which Bane breaks Mr. Wayne's back. He leads police forces, civilians and others to escape the terror of Bane's bomb. Batman decides to fly out the bomb from the city himself by using his flying Bat Helicopter. In the silent scene, foster kids along with a majority of the citizens of Gotham watch the humble act of the Dark Knight on his suicide mission.
As the scene continues with the bomb exploding, viewers watch the silent scene with a sad and emotional feeling. This scene is truly unbelievable as it shows Batman's true personality of a man trying to others, not a rich business man.
"The Dark Knight Rises" is an amazing movie that includes my favorite movie scene, as of now.