Architecture abounds this spring in Milwaukee. The Milwaukee Art Museum (414-224-3200) opens the season with a Georgia O’Keeffe exhibit and unveils a new wing (above) designed by celebrated Spanish architect Santiago Calatrava. The glass-walled space is topped off by a sun screen that can be raised or lowered. It’s a pretty cool roof. Almost as cool as the fan-shaped, retractable roof that covers Miller Park, the new home of the Milwaukee Brewers. (800) 933-7890;