Half-Life, complete map, by Corinthian.

Full map large; just part 2 large.

[Josh says: holy dang, but he’s gone and done the rest of the game.  As with his Half-Life part 1 map, tumblr’s maximum size for images leaves the notes on this image pretty much unreadable, but Corinthian was kind enough to send me the images directly, so check out the “large” links above for 2000px images that are much more legible.]