https://en.wikipedia.org/wiki/Colossal_Cave_Adventure
And the 2023 graphical remake (from Ken and Roberta Williams [King's Quest, etc.] no less):
It's a featured article on Wikipedia! (“This article appeared on Wikipedia's Main Page as Today's featured article on May 17, 2022.”)
Also there are many versions/implementations:
IFDB has tons of ports.
The Puny Inform version will run on every computer since the 70's with a ZMachine interpreter. Even the ZX, C64 with OZmoo and so on.
The 2023 version is not a port, but a 3D graphical remake. I thought it was interesting for that reason and also since it was developed by the founders of Sierra.