Reddit reviews Pathfinder Campaign Setting: Dungeons of Golarion
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Used Book in Good Condition
It's not 5E, but the Pathfinder supplement Dungeons of Golarion gives several themes for mega-dungeons. In particular, the last one, the ruins of a mine overrun by undead, is my favorite description and setup of a mega dungeon that I have ever seen.
The book doesn't detail ready to run dungeons, but instead has a chapter on each dungeon, giving a history/backstory, level descriptions or overviews and some unique monsters or magic-items that can be found in the dungeon. It should be readily usable for 5E or 4E. If you can get a copy it might be a decent source of inspiration.