Yeah, I made a wish for World Peace and a new LRB M14!
That Tunguska thing was wild. I think it flattened more like 400 square miles, but I am not sure. It was a huge airburst. Trees were flattened in a radial pattern in all directions away from the blast center. In the center, trees remained upright, but with all of the limbs stripped off. Big fireball and forest fires were associated with it. Leonid Kulik, a Russian scientist, mounted an expedition to Tunguska in 1927. There was still considerable evidence of the blast at that time. A more recent expedition a couple of years ago found evidence of two or three small craters seemingly related to the blast.
Estimates of the blast's magnitude range from 5 to 30 kilotons of TNT.
Imagine what would happen if something like that happened today over a populated area.