Guild Wars 2

What is it – or was it – or is it going to be?

It is an area of Guild Wars 1 in the Eye of the North expansion that you can use to “register” certain GW1 achievements. As you register these achievements from GW1, you get points that allow you to unlock various minipets, skin unlocks and titles in GW2.
There is a nifty page set up that shows you what achievements the Hall of Monuments accepts and what you get for them.

http://hom.guildwars2.com/en/#page=welcome