WHAT: "Turner, Whistler, Monet: Impressionist Visions" at the Art Gallery of Ontario in Toronto.

WHEN: Now through Sept. 12.

WHY GO: Because it's your only chance to see this exhibit -- featuring 60 paintings and more than 60 works on paper by British artist J.M.W. Turner, American James McNeill Whistler and Frenchman Claude Monet -- in North America before it moves on to London and Paris.

DON'T MISS . . . Whistler's most notorious canvas, "Nocturne in Black and Gold: The Falling Rocket" (1875). In it, a fireworks display in a London garden becomes a haunting swirl of colors, in which the details of the landscape vanish into a sea of dark forms.

ADMISSION: $13. Tickets are available at the AGO box office or with a surcharge via TicketKing (800-461-3333, www.ticketking.com).

PACKAGES: Call TicketKing to book package deals at various Toronto hotels (800-461-3333). For example, the Metropolitan (108 Chestnut St., 416-977-5000, www.metropolitan.com/toronto) offers a night's lodging, breakfast for two and a pair of exhibition tickets for about $155 before taxes.The Fairmont Royal York (100 Front St. W., 416-368-2511, www.fairmont.com) offers a similar deal -- lodging and two tickets -- from $190.

INFO: Art Gallery of Ontario (317 Dundas St. W., 416-979-6648, www.ago.net). Toronto Convention and Visitors Bureau (800-499-2514, www.torontotourism.com).

ALSO WORTH A TRIP: "Childe Hassam: American Impressionist," through Sept. 12 at New York's Metropolitan Museum of Art (212-535-7710, www.metmuseum.org) . . . "Edward Hopper," through Sept. 5 at London's Tate Modern (011-44-20-7887-8000, www.tate.org.uk/modern) . . . "Beyond Geometry: Experiments in Form, 1940s to 1970s," through Oct. 3 at the Los Angeles County Museum (323-857-6000, www.lacma.org).

-- Seth Sherwood