Bridge connecting Millennium Park with Daley Bicentennial Plaza, designed by Frank Gehry

Bridge connecting Millennium Park with Daley Bicentennial Plaza, designed by Frank Gehry

Lighting fixture, Grand Luxe Restaurant, Michigan Ave

Lighting fixture, Grand Luxe Restaurant, Michigan Ave

The Chicago Skyway at dusk

The Chicago Skyway at dusk

The USAF Thunderbirds perform at the Chicago Air and Water Show

The USAF Thunderbirds perform at the Chicago Air and Water Show

One of Tiffany's largest works, the GAR Dome in the Chicago Cultural Center

One of Tiffany's largest works, the GAR Dome in the Chicago Cultural Center

One of many summertime festivals, the Chicago Blues Fest attracts crowds to the Petrillo Bandshell in Grant Park

One of many summertime festivals, the Chicago Blues Fest attracts crowds to the Petrillo Bandshell in Grant Park

One of the largest infrastructure projects in the U.S., the Metropolitan Water Reclamation District's "Deep Tunnel" extends some 300 feet below the surface

One of the largest infrastructure projects in the U.S., the Metropolitan Water Reclamation District's "Deep Tunnel" extends some 300 feet below the surface

The House of Blues, Chicago

The House of Blues, Chicago

The Opus state-of-the art bus, a recent addition to the CTA fleet

The Opus state-of-the art bus, a recent addition to the CTA fleet

The staircase of the landmark Rookery Building, remodeled by Frank Lloyd Wright

The staircase of the landmark Rookery Building, remodeled by Frank Lloyd Wright