Which five-word nickname describes Philadelphia?

Which small nation, about 30,000 people strong, lies just miles from Rimini, Italy? Five women condemned in the 1692 Salem witch trials were finally exonerated by a bill signed on which day in 2001? Five-touch bouts are part of which combat sport? Five weeks after surrendering to the Allies in 1943, Italy declared war on which country? Fifty aluminum flagpoles encircle which Washington, D.C., landmark? Fifty-cent coins issued in 2003 by which country depicted Frodo, Gandalf, Gollum, Sauron and Aragorn? A 50-foot-tall, metal-eating, talking robot befriends a boy in which 1999 animated film? The 5000, A4 and A8 are models from which German automaker?