How Big are Planetary Structures in 40K - Warhammer's Biggest Buildings

It is well known that warhammer 40K cranks up everything to the next level and nothing can exemplify that statement more than the structures and buildings described in the lore. The planetary structures here are on a truly monumental scale, often pushing the boundaries of what we think is physically possible and at most times making possible the impossible. These colossal fortresses, palaces, and other constructions of the imperium and even other xenos races are so large they define the very geography of the planets they occupy. So lets take a brief dive into them.
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Credits:
https://wh40kartwork.tumblr.com/post/...
https://www.deviantart.com/kotrozvidk...
https://40k.gallery/necromunda/
https://40k.gallery/hive-city-spires/
https://sketchfab.com/3d-models/warha...
https://40k.gallery/upper-levels/
https://www.warhammer-community.com/
https://wh40k.lexicanum.com/
https://warhammer40k.fandom.com/wiki/
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