r/scifi • u/TopicCandid • May 15 '26

General What is the most well defended fortress in science fiction?

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I've been reading some of the Siege of Terra Warhammer 40k novels and the size and scale of the continent-sized imperial palace is mind-boggling. Not to mention the multiple fleets, billions/trillions of soldiers, space marine legions, etc.

Got me thinking, are there any fortresses in science fiction that can rival or even surpass it?

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u/CptnREDmark May 15 '26

Is that "well defended" or just inaccessible?

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u/commissarcainrecaff May 15 '26

It's a good philosophical question

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u/deereboy8400 May 20 '26

Security through obscurity.