This landmark 1900 building is not technically open to the public, aside from a restaurant on the ground floor. (The lovely second-floor Great Hall, flanked by two curving loggias, is one of the city's most popular wedding reception spots; if you stop by on a weekend, chances are, you can sneak a peek while the caterers are setting up.) Even if you don't make it inside, Cafe Brauer is a nice stopping-off point during a walk around the park. Best of all, though, is the picture-postcard view from the adjacent bridge spanning the pond of the John Hancock Center and neighboring skyscrapers beyond Lincoln Park's treetops. Allow a quarter-hour.