These are photos of The Rookery, a very famous building and Chicago icon. After the fire in 1871, the city exploded with new growth, and this building is a fine example. It was designed by the well-known architectural firm Burnham & Root (who was at center stage in "Devil in the White City"). The building was revolutionary in 1888, when it was built. First, at 11 stories tall, it was one of the first buildings to use metal framing with masonry walls on such a large scale. Today it is considered to be the oldest standing high-rise in Chicago.
Because of the innovative design, it allowed the use of large expanses of glass, which gave access to unprecedented amounts of light and air. As you can see in the pictures above, the "light court" or the center of the building (which was designed by Frank Lloyd Wright in 1905) almost seemed like a bird cage.
This structure is breathtaking. It is located at 209 South Lasalle Street. If you are ever in the financial district, you should take a moment to pop your head in. I guarantee it will be a highlight.