Asking an art historian for her favorite art work is like asking a mother to choose her favorite child. Impossible!
But here are three Washington DC masterpieces that I love to revisit, always finding more to see and ponder: Leonardo da Vinci, Ginervra de Benci (the only da Vinci painting in the Americas) in the National Gallery of Art, Jackson Pollock, Number 1, 1950 (Lavender Mist), also the NGA and Maya Lin, the Vietnam Veterans' Memorial.
Ginevra de' Benci, c. 1474-1478, Leonardo da Vinci
Number 1, 1950 (Lavender Mist), 1950 by Jackson Pollock (American, 1912 - 1956)