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  "path": "/2026/06/03/what-happened-to-the-2-5-mile-high-building-designed-to-be-taller-than-mount-fuji.html",
  "publishedAt": "2026-06-03T18:56:33.000Z",
  "site": "https://boingboing.net",
  "tags": [
    "Post",
    "architecture",
    "Japan",
    "megastructures",
    "skyscrapers",
    "Taisei Corporation",
    "urban planning",
    "the X-Seed 4000, a tower four kilometers tall",
    "Read the rest",
    "What happened to the 2.5 mile high building designed to be taller than Mount Fuji?",
    "Boing Boing"
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  "textContent": "In 1995 the Japanese construction giant Taisei Corporation unveiled plans for the X-Seed 4000, a tower four kilometers tall — a building shaped like Mount Fuji that would have stood 224 meters higher than the actual mountain.\n\nIt called for 800 floors, room for up to a million residents in Tokyo Bay, and more than three million tonnes of steel. — Read the rest \n\nThe post What happened to the 2.5 mile high building designed to be taller than Mount Fuji? appeared first on Boing Boing.",
  "title": "What happened to the 2.5 mile high building designed to be taller than Mount Fuji?"
}