We all know that this game is full of off-limits areas and hidden locations. I'd like to hear from the members of the OwnedCore exploration community on YOUR first exploration in the World of Warcraft. Note that this is a great opportunity for all of you forum lurkers, Lazy Leechers and first-time-posters to come out of the woodwork and join in the discussion!
What was the first hidden location in WoW that you remember visiting, and how did you get there?
For The Wizard Trokair, it was inside the purple bubble in Dalaran, before the city was moved to Northrend. A friendly Mage had showed me that you could Blink into the bubble, and I was fascinated.
Here is a video of this exploration (not my video): http://www.youtube.com/watch?v=sGniydwyrEs
(I also have a foggy memory from many years ago (2006?) of accidentally blinking through the Deadmines portal... but I don't actually remember running around in Deadmines Secret. IIRC, I only fell to my death and saw strange graphics... didn't know what I was looking at... and didn't investigate. This is probably my first WoW exploration experience, but it wasn't intentional and I don't properly remember it.)