These are all adventures, next time we should make a poll with the same question about non adventures.
I was thinking about X-COM, Star Control, The Elder Scrolls, Gateway (adventures)... And yes, Flashback of course.
About these, I think I'm going to say Monkey Island. I haven't played many of these. I don't see Loom as a movie. I would love another Indiana Jones movie if it was good of course, and I liked the game (not as much as the Last Crusade), but Atlantis is more pulp compared to the Christian mythology in the Last Crusade and the Lost Ark, and the plot of the game is a bit like a Dan Brown novel--much like the last Indiana movie was a bit like an Erich von Däniken book.