Dayshot: Evidence number one: a highly detailed (and awesome) Unreal Development Kit recreation of Dr Kleiner's Lab from Half-Life 2.
Level designer/environment artist Charlie Pharis started by painting over a screenshot of the original HL2 location to create a concept:
Then, after several weeks of work, he came up with the finished map:
Exploring Pharis' website reveals even more Half-Life-related art. Pretty good stuff, overall.
Dayshot showcases some of the prettiest, funniest game-related screenshots and art that we can find.