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We started our second day in Chicago at one of Frank Lloyd Wright's masterpieces: the Robie House on the campus of the University of Chicago. You aren't allowed to photograph the inside, which was resplendent with natural light streaming in through leaded glass windows. Robie House showcases the Prairie style of architecture (characterized by an open floor plan, no basement, and a horizontal orientation) for which FLW was so famous.

We continued our architectural tour of Chicago on a boat ride on the Chicago river (which, incidentally, originally ran into Lake Michigan, but as a result of an engineering feat now flows away from the lake into the Mississippi).

This picture shows the Wrigley building on the left, and the gothic Tribune Tower building on the right. The newspaper ran a contest to determine the winning design for "the world's most beautiful office building."

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Newspaper correspondents have returned from their travels around the world with pieces of famous historical buildings, and these "souvenirs" are embedded in the front of the Tribune Tower. Here is a brick from Edinburgh Castle. The Tower is studded with more than 100 pieces ranging from the White House to the Berlin Wall!

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Here is Marina City, two unique apartment buildings on the Chicago River. (Locals affectionately call them "the corncobs.") Residents can dock their boats along the banks of the river, and the bottom floors of the building are parking lots. Each trapezoidal-shaped apartment has a balcony. Wouldn't this be a fun place to live?