Best looking games?

Minesweeper

Newest God of War looks amazing.

The ones you really enjoy playing.

Prince of Persia (2008) has a great art style and looks beautiful.

SKYRIM!

Stacking has a very unique and great looking art style

Memory of a Broken Dimension really blew my freakin' mind. Not really a full game but it's still pretty damn gorgeous.

deadlight

Bastion is pretty nice.

Here's a few:
Sonic & Sega all stars: Transformed,
Sonic Generations,
Trine 1 & 2,
Rayman Origins,
Crysis,
Nyx Quest: Kindred Spirits,
Shadow of the Colossus

Total War Shogun II
and Total War Rome II
check out Rome's screenshots

Muramasa: The Demon Blade and Odin Sphere. Vanillaware makes candies for eyes

crysis and mirrors edge

the ones that you remember 10 years after playing them :P

Big Rigs: Over The Road Racing

modern games

Tibia, Minecraft and Dubstep!

Hmmm, every game's beautiful on it's own perspective. I'll say Bioshock: Infinite and Bastion.

Okami HD, but that is for PS3...

How good the game looks depends on what type of game it is. I liked Bastion and Limbo, but those same art styles in other things would not work.

Uncharted 2, Crysis 3, Rayman Origins, Dust: An Elysian Tale, God Of War Ascension, Halo 4, Batman: Arkham City, Metro 2033, The Secret World (Just for the environments alone, the animation are crap), Lost Planet 2, Alice: Madness Returns, El Shaddai, Child Of Eden, Ni No Kuni, Tomb Raider, Hitman Absolution, FarCry 3, Medal Of Honor Warfighter (It looks much better than BF3 IMHO), Dark Souls, the BlazBlue series and Ultimate Marvel Vs. Capcom 3.

Zork! >_<

That new game, God Mode. I can't believe the detail in that game. Some of the best looking level design I've seen in awhile! It's also ridiculously fun as hell!