Best looking PC game prior to the arrival of PS4/X1

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Of all the PC titles that came out before PS4/Xbox One showed up on scene, which had the best graphics, in your opinion?

Note: PS4/X1 multiplats that came out before those systems themselves, like COD Ghosts, are not eligible. Similarly, mods that weren't around before PS4/X1 came out don't count either.

So basically, if I took a time machine back to mid 2013, what's the best looking PC game I could find?