Have you heard of Artips? Well don't worry, because now you have. It's awesome. You get weekly emails that include a piece of art and some background information on it.
For example, this week's email was called "A Clairvoyant Canvas?" and told the story of Giorgio de Chirico's painting Premonitory Portrait of Guillaume Apollinaire. The painting was a gift for poet Guillaume Apollinaire, who helped Chirico sell his first painting, and it may have predicted Apollinaire's death! Spooky and educational.