Atlanta is the 9th largest metropolitan area in the U.S. with over 5.7 million people. It has three commercial districts: Downtown, Midtown and Buckhead. Similar to other top ten cities, the skyline is filled with glass high-rises such as this Centennial Tower built in 1975. But unlike most cities, about one-third of the area is covered with trees. This is why its nickname is, “The City in the Forest.”