Mona Lisa? Been there, done that. The Blue Boy? Seen it. Michelangelo's Pietà? Ancient history! But don't think you've done it all. Everyone should see these more obscure - yet just as great - works of art in their lifetime. So put on your glasses and get gazing. - Becca Hensley

1.Autumn Rhythm (Number 30)
Jackson Pollock, 1950
The Metropolitan Museum of Art, New York
Part of a series of immense, eloquent canvases Pollock created that year, this painting manifests the artist's ability to walk the razor's edge between controlled and accidental creation in his work. He was known to pour, drip, and splat paint, and his intuitive, radical technique matched his personality. www.metmuseum.org

2. A Grotesque Old Woman
Quinten Massys, about 1525-1530
The National Gallery, London
Based on a drawing by Leonardo da Vinci, this portrait is both whimsical and horrifying. Apelike, she leers from the wall of the National Gallery in perfect satire. Her low-cut bodice and seductive pose should serve as cautions to those who dare to dress in a manner inappropriate for their winter years. www.nationalgallery.org.uk