Seriously? You've reached level 16 without managing to unlock any Homestead portals? I'm going to guess you haven't used any Blood Stones. Do so, use them. And in future pay more attention to your surroundings in game, read books for one thing, a lot of information on how the game works is in them.
There are four elemental portals. If it's not obvious to you which ones they are... I'll leave that unsaid.
