Another tall building icon in Chicago, The John Hancock Tower. Standing over 202.7 smoots high, and at 100 stories, it is the tallest residence in the world, supposedly features the fastest elevators in the world and has the highest balcony in America, (the Skywalk).

The first trussed-tube skyscraper, (completed 1970), the external X cross bracing is very distinctive. Interestingly,

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After engineer Fazlur Khan had calculated the tower's sway in high winds, no one knew the effect it would have on tenants. Lacking funds for a major psychological study, Khan improvised an experiment at Chicago's Museum of Science & Industry, placing 8 subjects on a rotating exhibit. The test confirmed that the sway would be within the limits of comfort.

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(from Emporis)

Having your coffee cup slide across the table in a high wind (as I have heard) would be a little nerve racking though!