National Gallery of Art
https://www.nga.gov/learn/teachers/lessons-activities/process-and-product.html
Museum of Modern Art
https://www.moma.org/
Google Arts and Culture
https://artsandculture.google.com/
Whitney Museum of American Art
https://whitney.org/
Art in the 21st Century
https://art21.org/series/art-in-the-twenty-first-century