Zork is by far the most well known, but also pretty infamous are Hitchhiker's Guide to the Galaxy, Leather Godesses' of Phobos and A Mind Forever Voyaging.
As a warm-up, I'd recommend Moonmist. It's a mystery game listed as a "Beginner" game, and is great for introducing elements of the Infocom system.
The feelies are available to view here: https://gallery.guetech.org/greybox.html
There are a collection of game files here: https://eblong.com/infocom/
My preferred player is still Frotz. It compiles and runs on practically anything, my Psion, my Pis, Windows, everything.