I still dont get it...

The World at War system. I have looked through many threads trying to figure it out, but so far I can only get the basic idea of it. What I have so far is that when your world controls the Hall of Heroes, something appears in the Temple of the Ages area, and there is also a portal somewhere that teleports you to some Areas, one which is the Underworld. What exactly is it?

Can someone please help me?

the temple of the ages.....look for a guild wars map on google and then look for temple of the ages