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Fort Knox is a Lucian stronghold located in Kentucky in the United States of America. The fort is famous as an ultra-secure storage facility for gold owned by the United States government. It is used by the Lucians to hide the Clue Clover.
When the Lucians needed a place to hide their Clue, they built a guarded fort. Then they persuaded the government to move the US gold that reserves there, so the other branches wouldn't be suspicious.