Historical clue formulations

• Like the Taj Mahal and the Hagia Sophia, architecturally — 2026-08-09
• Rounded up? — 2026-05-02
• Rounded, in a way — 2025-09-13
• Like many mosques — 2022-07-15
• Round up? — 2019-11-02
• Like the Pantheon — 2016-02-07
• Like Royal Albert Hall — 2014-10-17
• Like wigwams and igloos — 2014-01-17
• Like the Capitol — 2012-11-07
• Protected from rainouts, say — 2012-10-10
• Like St. Basil's — 2008-02-15
• Like some heads — 1998-09-27
• Like many football stadiums — 1995-12-14
• Like St. Peter's — 1995-07-23
• Round on top — 1995-06-28
• Like many football stadiums — 1993-12-30