Sci-Fi Fortress of Skyscrapers to Surround & Defend Japan

This is a conceptual project with a breathtaking scope: to create a perimeter of citadels surrounding Japan, protecting the island nation above, on and below the ground.

Secret bunkers and bases in your world? : r/worldbuilding

Neom releases renders of Zaha Hadid Architects' crystalline skyscraper

static.wikia.nocookie.net/godzilla/images/2/2b/God

Evil Tower of Ominousness - TV Tropes

Sci-Fi Fortress of Skyscrapers to Surround & Defend Japan - WebUrbanist

Are there any castles in Japan remain originally constructed (not reconstructed)? - Quora

Castle - Wikipedia

Blue Archive (Video Game) - TV Tropes

Sci-Fi Skyscrapers: 14 Futuristic Visions for Vertical Cities - WebUrbanist

9 Myths About Medieval Moats and the Truth Behind Them