The Sheldon Memorial Art Gallery and Sculpture Garden is home to more than 12,000 works of art in all media and is a comprehensive collection of American visual art. It has prominent holdings in 19th century landscape and still life, American impressionism, early modernism, geometric abstraction, abstract expressionism, pop, minimalism, and contemporary art. The museum has the largest collection of 20th Century North American art in the world; it includes works by artists including Edward Hopper, Andy Warhol, Jackson Pollock, Mary Cassatt, Wayne Thiebaud, and Georgia O'Keeffe.