Original source code found for Colossal Cave Adventure, Wil Crowther's 1972 text adventure computer game. the FORTRAN source code accompanies an excellent article celebrating the anniversary of Adventure, which also includes photographs of the actual caves on which Adventure was based.
Adventure spawned dozens of remakes and extensions, but this is the first readily available copy of the original source code, long thought to be lost.
Wow, that article was totally amazing. I still remember when I was a young college student and I discovered this brand new program called Colossal Cave. I spent many hours playing it, week after week. Unfortunately, the only freely accessible system that I could find was a long distance phone call (I had a Carterphone 300 baud acoustic coupler) and I was continually broke from $200+ phone bills.
You know, I wonder if I have any of the notes and maps I drew while playing, maybe I have one in my old files somewhere. I wonder how closely my map corresponds to Wil's maps.