Historical clue formulations

• Many a public artwork — 2025-08-25
• Diego Rivera's "The Allegory of California," for one — 2024-06-02
• Bit of urban art — 2024-05-02
• Banksy work — 2023-10-20
• Artwork that's hard to move — 2023-08-27
• Certain subway art — 2023-08-20
• Many a work by the artist Banksy — 2022-05-27
• Banksy's "Girl With Balloon," e.g. — 2022-03-29
• Unframed artwork — 2020-07-29
• Leonardo's "The Last Supper," e.g. — 2019-07-03
• Certain street art — 2018-11-09
• Sistine Chapel feature — 2018-07-25
• Diego Rivera's specialty — 2018-05-10
• Wall painting — 2015-04-13
• "The Last Supper," e.g. — 2014-09-18
• Certain work of subway art — 2012-11-04
• "The Last Supper," e.g. — 2008-05-22
• Wall art — 2008-02-11
• Wall art — 2007-11-06
• Diego Rivera work — 2007-02-14
• Work by Chagall — 2006-04-12
• Hard-to-move painting — 2004-11-17
• Big picture — 2004-02-20
• Many a commissioned artwork — 2003-12-23
• Big picture — 2003-04-16
• Piece of cave art — 2003-01-29
• Giotto work — 2002-12-15
• Bit of street art — 2002-08-20
• Piece of cave art — 2001-02-27
• Piece of street art — 1999-08-13
• Subway artwork — 1998-12-29
• Michaelangelo work — 1995-05-15
• "The Last Judgment," e.g. — 1994-12-03