The centennial celebration at Delaware Art Museum continues with “100 Works for 100 Years.” The exhibition shows the evolution of the museum’s holdings through at least one work—including new acquisitions and gifts—for each year of its existence. See it indoors and out in the sculpture garden. If you’ve ever wondered how the museum became such a force in Pre-Raphaelite art, this is your chance. The exhibition runs June 23-Sept. 16. (571-9590, delart.org) —Mark Nardone