Here are some of my favorite PC games, ancient and nostalgic
The Secret of Monkey Island (1990)
Dune (1992)
Day Of The Tentacle (1993)
Sam & Max Hit the Road (1993)
7th Guest (1993)
Simon the Sorcerer (1993)
Beneath a Steel Sky (1994)
Lost Eden (1995)
The Dig (1995)
Shivers (1995)
Simon the Sorcerer 2 (1995)
Discworld (1995)
Discworld 2: Missing Presumed (1996)
Heroes of Might and Magic 2 (1996)
The Settlers 2 (1996)
Broken Sword: The Shadow of the Templars (1996)
Broken Sword 2: The Smoking Mirror (1997)
Grim Fandango (1998)
The Longest Journey (1999)
Monkey Island 2: LeChuck’s Revenge (1991)
Baldur's Gate series
King's Quest series
Myst series
The Elder Scrolls series
Most of these games are and free to download/play.
For most of them you'll require , or another emulator to be able to play.
Some of these games are remade or enhanced later on, so also keep an eye out for these!