The familiar and the undiscovered meet here, at one of the best art museums in the world. You can take a mobile guide, concentrate on a particular period, or head straight to one specific piece. The vast permanent collection soars from classical to contemporary, prints to photography, musical instruments to textiles. The Impressionism gallery alone includes Gauguin’s masterpiece Where Do We Come From? What Are We? Where Are We Going?, the Degas sculpture Little Fourteen-Year-Old Dancer, Van Gogh’s Houses at Auvers, and works by Cézanne, Pissarro, Signac, and Sisley. There’s an entire gallery devoted to Monet. Three don’t-miss paintings are deeply Boston in subject matter and much beloved: John Singleton Copley’s iconic portrait of Paul Revere (1768); John Singer Sargent’s Daughters of Edward Darley Boit (1882); and Childe Hassam’s At Dusk (Boston Common at Twilight) (1885–86).