@ThreeOhFour this is far less engimatic than the hive, but this location in ultima viii captured my imagination for a decade
in a cave near mythran's home, there is a set of massive, locked, double doors. i searched under every skeleton and behind every chest for months, trying to find a way to unlock them. my buddy at school and i talked for months about what we thought might be behind them.
we graduated, and never figured it out.
15 years later i found out that the doors could only be opened by summoning a golem, using a single pixel of dirt in the area. the golem pries the doors apart and it leads to....
... a big empty room 😆
this was supposed to be a teleport/transition area to the Lost Vale expansion, that never got used in the final game.
some things are best left to the imagination i guess.