I passed on #Riven for now, but I picked #Firmament and #Obduction instead (these games are now old enough for my laptop).
Firmament has that definite style of late #MYST (IV-V) - deserted worlds, huge machines, some background apocalypse story, and a bit cheap-looking because of reuse of some generated textures, but nevertheless epic.
Obduction is sort of more realistic, most of the game happens in the Earth-like part of the world. But then it has some mind-bending transportation mechanics.