A wildfire burning since July 4 has closed the North Rim of Grand Canyon National Park for the rest of the season.By Nicholas KusnetzA wildfire that has closed the North Rim of Grand Canyon National Park raged out of control over the weekend and is now the largest currently burning in the country. The Dragon Bravo fire has burned more than 123,000 acres and was only 13 percent contained as of Monday afternoon, according to a federal interagency website that tracks wildfires.