This is one of those locations you visit all the time without even knowing it, or realizing it perhaps. Runeweaver Square in Dalaran is most known for the monument that you click to see the proverbial end of the Lich King. It became an option after a Guild on your server defeated Arthas, if I recall correctly. However, pretty much any time you port into Dalaran you run down a flight of stairs and into the town. In doing so, this is where you pass through at the bottom of those stairs.