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Underground Passage Alba Carolina Fortress. Alba Iulia - September 09: Underground Passage In The Fortress Alba Carolina, Designed By Architect Giovanni Morando Visconti, At The Behest Of Emperor Charles Vi Of Habsburg On The Site Of The Ancient Apulum, Founded By The Romans In The 2Nd Century A.d., And The Site Of The Proclamation Of Transylvania's Unification With Romania (1 December 1918) And Of The Coronation Of King Ferdinand In 1922.