The Rookery Building isn’t just another office building in downtown Chicago—it’s a slice of architectural history with a bold personality. Completed in 1888 by the legendary team of Burnham & Root, it was a game-changer, mixing old-school masonry with cutting-edge steel-frame construction—basically, the birth of the modern skyscraper. Then in 1905, none other than Frank Lloyd Wright gave the lobby a stylish makeover, adding his signature Prairie-style flair to the grand, light-filled atrium. With its mix of Romanesque arches, Moorish details, and that jaw-dropping glass ceiling, the Rookery is a design mash-up that totally works. Today, it’s a National Historic Landmark, a working office building and the place we will party all night long in!