Silent Age and Republique!! Those are awesome. Also there is the original Myst and realMYST. Those games are hard but worth playing. I suggest looking at a guide for Myst. Silent Age nails the 70s and post apocalyptic vibe. Republique’s atmosphere is super immersive too. You can easily get lost in that game.
Definitely Myst and Riven. Try Shadowgate Machinarium Gemini Rue I Have no Mouth and I Must Scream Beneath a Steel Sky
