I'm gonna have to go with Doom and Doom II as some of my favorite games of all time. The music, the art, the
speed... it's all just amazing. And it still holds up today! I suggest anyone who hasn't already played to do so now. The best way to play is with
GZDoom, which allows the game to work flawlessly on modern systems with conveniences such as mouselook and tons of options for graphics. All you need are the .WAD files, which you can get from the games' files on steam (the games are pretty cheap).
I also completed MYST late last year, and I have to mention it as an old-school CGI enthusiast. Though it clearly shows its age, it's a fantastic, puzzle-laden romp through a number of pre-rendered sci-fi/fantasy worlds. The Masterpiece Edition on Steam is inexpensive and works fine on modern systems.
And only a couple weeks ago, I finished Grim Fandango Remastered, another excellent example of 90's pre-rendered videogames (I played with the new graphical updates turned off, of course

). The game itself is a lot like MYST, but with lots more character interactions and less frustrating puzzles. The aesthetic of the world is also fascinating, combining mesoamerican themes of the afterlife with elements of 30's and 40's film noir. The characters are well-written and absolutely hilarious. Even if you're not a fan of point-and-click games, this is a LucasArts classic you shouldn't miss.
View: https://www.youtube.com/watch?v=QRB6Likh478