Click each image for a lightbox view.

Mourners file into Chicago's fourth city hall in May, 1865, at the funeral of Abraham Lincoln

Daniel Burnham's design for a massive city hall and cvic center, 1909

(click the image for a larger view)

(image source: Encyclopedia of Chicago)

Chicago's current (the seventh) city hall shortly after completion

Entrance Doors

(photo: Cragin Spring)

Lobby

(photo: Wendy Bright)

"Greenroof Garden," designed by William McDonough and Partners, completed in 2001

(photo: Marilyn Novy)

According to McDonough, the purpose of the rooftop garden is “to mitigate urban heat island effect, which is a process whereby highly urbanized areas with hard surfaces tend to be degrees hotter than green areas.”

(photo: Victor Zaveduk)

(photo: Victor Zaveduk)