Scientists and art experts found a hidden painting beneath one of Picasso's first masterpieces, The Blue Room, thanks to advances in infrared technology. Here, associate conservator Patricia Favero of The Phillips Collection points to a detail in the image. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP

There's an empty space today where a Henri Matisse painting had been hanging at the Kunsthal museum in Rotterdam, Netherlands. Seven paintings were stolen Tuesday, including works by Pablo Picasso, Claude Monet and Paul Gauguin. Peter Dejong/AP hide caption

itoggle caption Peter Dejong/AP