Monona Terrace

Frank Lloyd Wright designed this cool, white semicircular structure in 1938, though it wasn't completed until 1997. The one-hour tours explain why; tours are offered daily at 1pm May through October (Friday to Monday only the rest of the year). The building serves as a community center, offering free lunchtime yoga classes and evening concerts; check the program schedule online. The rooftop garden and cafe offer sweeping lake views.