Unpacking the mystery around the Austrian artist’s painting, which sold for €30 million in Vienna, plus a look at a retrospective of Horn’s pioneering practice and a newly conserved Cézanne

Museums now appeal for information on three unlocated panels in the artist’s 1950s Struggle series

Our pick of the latest gifts and purchases to enter museum collections worldwide—from Lee Krasner's record-setting painting to a Hogarth conversation piece

Exhibition at the Phillips Collection is curated by Massimiliano Gioni and will include works by Arshile Gorky, Mona Hatoum and Vija Celmins

A 200-year survey of work from the region suggests a common mystique