Historical clue formulations

• Common destination for a field trip — 2025-05-12
• Sight along the National Mall in Washington — 2021-06-05
• Curator's workplace — 2017-09-20
• Oil spot? — 2016-01-13
• See 23-Across — 2009-10-18
• Field trip destination — 2009-03-08
• St. Petersburg's Hermitage, e.g. — 2000-03-27
• Site for Seurats — 1998-02-08