You can't go wrong with the classics from the 90s. Go for Lucas Arts' games (Monkey Island series, Sam & Max, The Dig, Full Throttle etc.). Sierra had good series too, although I didn't play any of those (King's quest, Space Quest come to mind).
Then later you have Syberia 1&2, The Longest Journey, Still Life 1&2, Secret Files 1&2 etc

This

Machinarium - a great piece of work.

Thanks!

Myst and Riven. Fantastic.

Grim Fandango.

thanks

Cheers!

Like JovaZmaj said, you should try the classic Lucas Arts games if you haven't already. Besides those already mentioned so far, I would also add Day of the Tentacle(Lucas Arts), the classics from Revolution Software: Broken Sword: Shadow of the Templars and Broken Sword: The Smoking Mirror, Beneath a Steel Sky and also Lure of the Temptress; you should try Simon the Sorcerer 1 and 2, and also Flight of the Amazon Queen, which was made freeware.

Discworld! go get it

Thanks :)

The Longest Journey

Thanks!

Sanitarium, you can get it from GOG.

ty

(: uoy knahT

Apart from games which have already been pointed out, try point'n'clicks from Pendulo Studio: the Runaway series, The Next Big Thing, Yesterday.

Thanks

IP20

Beneath a Steel Sky is great! Lost Horizon looks nice, but I haven't played more than the demo.

thx

Beneath a steel sky! :)

The Neverhood!

Friggen Superbrothers: Sword & Sworcery!
Also, I say thank you* before winning because you're being generous and giving away something you [most likely] paid for. I am appreciative of that because it keeps Steamgifts going, and an lucky just for the chance to win a game I wish to play. =)

*I do go out of my way to try and say more than just a simple 'thanks'.

thank you for the chance