Sometimes the game really makes me feel small. Flying over Storm Peaks gives me a rush and a feeling of grandeur -- the mountains are so high! When I head over to Icecrown, the armies of undead can be truly intimidating, and it provides but a glimpse of the promise of Icecrown. When I first entered Hellfire Peninsula back when the Burning Crusade launched, it felt truly epic because I'd never seen anything so vast before. And who didn't shudder at the first sight of a Fel Reaver? Heck, even the humongous caverns of Maraudon still amaze me, and that flatulent little Princess will always be one of my most epic experiences.
Blizzard has always put a few encounters that dwarf us. Dragons are certainly appropriately huge, and it works. It feels grand. It feels epic. That's why I thought Mount Hyjal was fun -- aside from being steeped in lore, everything was whimsically oversized! But the experience was just improved by it. Ulduar's size just reminded me that sometimes, big is better. What were your most epic adventures in Azeroth? What big things in the World of Warcraft have amazed you?