The best replacement for dungeons is dungeon keeper.

The best alternatives to dungeons are rated as following:
★★★★★  dungeon keeper
★★★★  questing
★★★  dungeon keeper 2
★  raids
★  quests
★  questing wow
★  questing warcraft
★  impire
★  questing 85-90
★  questing faster
  labyrinth lord

Your alternative for dungeons is not listed? Suggest!
Speaking about dungeons, one probably shouldn't forget about quests.

Other search terms related to dungeons and their ratings are:
★★★★★ quests
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Google Trends

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dungeons
dungeon keeper
questing