How do you explain random generated dungeons in your in-game world?

Let's say, I generated a dungeon. It is fun, but the dungeon is kinda meaningless (of course, it is randomly generated). The rooms, treasures in them and monster encounters do not make much sense, the corridors between them are weird too.
The first thing that comes to mind: it is a magical anomaly (adjust to the world around the PCs).

Any other ides? Thanks!