Above Hallowed GroundBy: New York City Police Dept. An in depth visual chronicle of the 9 11 tragedy, its aftermath, and the heroism of those who saved thousands of lives. On the morning of September 11th, a new kind of horror shook the world. Terrorists crashed two passenger airliners into the World Trade Center in the worst attack on U. S. soil in the nation's history. But at the same time a new generation of heroes rose up to fight it. These images, which had never