Disable Fog of War
     Bring  out the console by pressing CTRL + ^ (try other keys if it
doesn't seem to work):

UI: FOWEnable (0) - Disables FOW

Console Cheats
     Either use Ctrl + ] or Ctrl + +. It depends on where you live and
got it from. Capital letters are important.

Cheat code:                   Effect:
LogSender:GiveGood(###)       Gives ### of all goods
LogSender:AddMoney(###)       Gives player ### gold to buy items
LogSender:GodMode(1)          Invincible
LogSender:NoManaUsage(1)      Spells or Abilities can be used again 
                              and again