http://www.thesilversandbox.net/p1999/main_l.php
From this list I'm pretty sure I've never been in Arena, Jaggedpine Forest, Qeynos Catacombs, Akanon. I've also only been in Grobb for about two seconds which doesn't really count since I've never actually been able to appreciate the zone. I'm betting most people here have been to every classic zone, but are there any other n00bs out here who've never been to certain zones?