Here's what Rockstar's Grand Theft Auto IV would have looked like were it a first-person shooter, and not a third-person... whatever you like to call these games.
Before you say it, I agree, it's not entirely practical for the purposes of playing the game. Combat, always the trickiest part of a GTA game, is made even trickier when you can't see your surroundings.
But as an exercise in immersing yourself in everything Liberty City has to offer, it's brilliant. When whizzing by in a car or running around in third-person, you may not appreciate how detailed the city is, but drop down to a first-person perspective and you realise how much work went into building the game's world.
This is a mod for the PC version of the game; you can find instructions at the YouTube page of the clip above.