The Jay Pritzker Pavilion sits at the heart of Millennium Park, its swooping stainless-steel headdress curling above the Great Lawn like something Frank Gehry dreamed up on a particularly inspired afternoon. Which, in a sense, he did. When asked about his biggest design challenge, Gehry had one answer: the wind.

Getting the pavilion built required clever bureaucratic theatre. Chicago's zoning laws blocked a structure of that height, so the city simply declared it a sculpture, not a building. Problem solved. The lakefront, legally required to remain "open, free and clear" since 1837, stayed technically unobstructed.

Home to the Grant Park Symphony Orchestra, it's the only venue in the United States offering a free outdoor classical music series with open rehearsals. VoiceMap's self-guided audio tours trace this corner of Millennium Park through Chicago's architectural ambition, revealing how the city turned legal ingenuity and one very famous architect into a landmark.