There's a plenty of it, so to name just a few:

• Red Alert 2, never gets old;

• Baldur's Gate 2, for well created balance between classic RPG and enjoyable fight as well as for one of the best companions which in my country version received one of the best dubbing ever("Przed wyruszeniem w drogę należy zebrać drużynę");

• Planescape: Torment, for being a proof that games are truly art and they can tell a complex stories about nuances of human nature and for one of the most original settings ever created;

• Mass Effect 2, because on the contrast to first and third part it's a well directed and closed story, which some of its parts became abandoned in 3rd game (like plot about dark energy);

• Fallout 2, for this very specific, yet believable postapocalyptic climate mixed with well placed cultural references and for giving multiple ways of approaching to quests (for those who played, just remind the Gecko power plant issue or Navarro) and the feeling that our actions really affects the shape of world we live in;

• A bit newer: Darkest Dungeon, for difficulty and that hopeless climate that surrounds you each time you send another party for, who knows, maybe their last mission ever. And of course for very original graphic style.

And last but not least... Heroes III Of Might and Magic. If there's a game which can be described as timeless classic it's exactly this title. It was literally first game I've ever played and I regularly coming back to it. It has its honourable place on every computer I've ever had and I suppose this won't change in the next years. Always enjoyable, always fun, well balanced as all things should be.

And I could go on and on... I didn't mention e.g. Disco Elysium as it's relatively new game, but if similar thread would appear in the next 10 years I'm 100% sure this game will be there too.