Historical clue formulations

• Famed Milan opera house — 2022-08-29
• Milan opera house — 2018-02-19
• Tourist attraction that faces a statue of Leonardo da Vinci — 2017-11-25
• Milan opera house — 2016-02-29
• Where Puccini's "Madama Butterfly" premiered — 2015-12-25
• Milan opera house — 2014-12-23
• Literally, "the Stairway" — 2012-02-11
• Where "Lucrezia Borgia" premiered — 2011-06-02
• Milan opera house — 2006-12-11
• Where "Falstaff" debuted, 1893 — 2004-03-07
• House of Milan — 2003-11-29
• Milan attraction — 2001-11-01
• Italian tourist attraction — 2000-04-09
• Where Renata Scotto debuted — 1999-09-26
• Where "Otello" premiered — 1998-11-01
• Where "Turandot" premiered — 1994-08-19