This is the Dungeon Heart and the treasury from a Minecraft recreation of a whole Dungeon Keeper 2 map. It was built by YouTuber spumwack in survival mode, which means he gathered all the materials by hand. Nicely done! There's many more (annotated) shots in the Imgur album below, showing off the various rooms.
It's raining expansion packs. GOG, still celebrating its fifth birthday, has made the expansion packs for five classic Bullfrog games available for free. So, owners of Syndicate, Dungeon Keeper, Magic Carpet, Populous, or Populous: The Beginning, know that another small part of your childhood has now been restored.