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3. Doomsday Vault, Norway
The Svalbard Global Seed Vault, also known as the “Doomsday Vault,” is a backup plan for humanity in case of a future disaster. Located in Norway, it stores millions of seeds to help regrow plants if needed. The vault is built to survive almost anything—earthquakes, explosions, and even rising sea levels—and is designed to last around 200 years. Because of its importance, only authorised people are allowed inside.