Thousands of motorists driving through a busy Canberra tunnel each day may be surprised to learn a few metres above is a secret building containing historic treasures.

More than 30 years ago a hidden bunker was constructed above the Parkes Way tunnel on the Australian National University (ANU) campus. ANU archivist Maggie Shapley says the two-storey structure disguised inside the hill includes the Noel Butlin Archives Centre.

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