When: On now
Why you should go: The AGO brings its massive modernism collection together in anticipation of the pieces being deposited in the new gallery wing, with construction beginning this year. The collection features the works of international art stars, including Andy Warhol, Helen Frankenthaler, Jules Olitski, Gerhard Richter and Mark Rothko, with a focus on Canadian artists, including Alex Colville, Rita Letendre, Jack Bush, Agnes Martin, Guido Molinari and Norval Morrisseau.