Danish artist Vilhelm Hammershøi's paintings had a recurring figure: a mysterious woman with her back turned. It was his wife Ida – here, her moving, sadness-tinged story is revealed.

Before his death, Paul Cézanne offered 100 of his paintings to the art museum in Aix-en-Provence, the city in southern France where he was born and lived for more than 40 years. Despite hosting ...