Slip's Music Database: MapleStory BGM & OST Collection

That track sounds like the Aurora Temple, though yeah that's not the one I'm looking for.

Here's a video where the bgm starts: http://youtu.be/VIb4sSpXb8k?t=31s

While I'm at it, I forgot how amazing Forest of Peace's bgm was. What's the name/where else does this theme play?

Ah okay. That track would be this one (The Stormy Forest) [link].
The other track is called The Aurora [link], and plays in many maps across Grand Athenaeum (Aurora Temple, field maps, etc).