In The Edifice, you parallel the history of humanity by going through important events in the history of mankind (such as discovering weapons).
The game is perhaps best known for its very well-done language puzzle, where you have to communicate with another person to learn their language.
Unfortunately, the solution to this and many other puzzles is obscure. The author assumes that you will use many items in ways that are not normal in interactive fiction, but which make sense in the game world. This seems like a good thing, however, there are a vast number of things that would make sense to do in the real world, and an author can only implement so many of those things.
I played this game on three different occasions over the years; the first time, I got stuck on the first door, go frustrated, and quit. Years later, I tried again, used a walkthrough on the first part, and tried the second part. I loved it, but go stuck, frustrated, and lost interest. Today, I just used a walkthrough through the whole thing. It's a great game, but my experience wasn't as enjoyable as it could be.