Historical clue formulations

• Like some walls at Harvard and Dartmouth — 2026-02-04
• Like the walls of an old church, maybe — 2021-04-23
• Covered in vines — 2021-02-07
• Like Wrigley Field's walls — 2017-12-17
• Like some walls at Harvard — 2017-10-03
• Like some college halls — 2014-12-07
• Like many academic halls — 2014-04-25
• Like some college walls — 2012-12-11
• Like the outfield walls at Wrigley Field — 2008-07-14
• Like some college buildings' walls — 2006-06-06
• Green on the outside? — 2004-11-05
• Like some walls — 2004-06-19
• Like the walls at Wrigley Field — 2003-04-14
• Like some hallowed walls — 2002-05-23
• Like some walls — 2001-09-15
• Overgrown, in a way — 1999-09-23
• Like Brown's walls — 1996-04-13