Thought this may be useful for some people who want to look around caves and stuff. Hope its not a repost!
You can "walk" farsight along the game and thereby see as far away as you like as well as deep into caves and even into unfinished areas of the game.
1. Make a hotkey for farsight.
2. Cast farsight into the direction you want to look as normal.
3. Hit your hotkey while still in farsight mode and before the view shifts back to normal click the targetting cursor onto the ground in the direction you wish to look.
Its fun to do for those "Secret" Places (Houses on hills and stuff).