The Sears Tower contains 25,000 miles of electrical cable and 43,000 miles of telephone cable.
May 1 at 8:23 PM
Much of Chicago's water is pumped through a 20ft diameter tunnel from the "two mile crib", two miles offshore, to a filtration facility near Navy Pier.
April 26 at 10:01 PM
The Adler Planitarium was the first planetarium in America, founded in 1930 by Chicago businessman Max Adler.
April 17 at 8:36 PM
The wood pilings, concrete steps, and huge rocks along the lake shore are different solutions to the same problem: how to keep the land from eroding into the lake.
April 11 at 2:12 PM
The first building in Chicago to offer air conditioning was the Wrigley Building, in 1921.
April 4 at 8:21 PM
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