What Jerz's paper doesn't tell you is that near Colossal Cave is the best-named cemetery ever.
The original CC source code, long thought lost, was discovered in 2005! How did I miss that? Mon Aug 13 2007 23:57:
Dennis Jerz's primary-sources paper on Colossal Cave is awesome. Reminds me of the IF game I never wrote based on my Colossal Cave experience, where you have to get into the cave despite the inconveniently scheduled tours and unhelpful people in the park station.