The smallest park in the biggest city would supply with a bit of sustainability. Just because it is a park, Millenium Park is a sustainable resource to the city of Chicago. Especially if the grounds where the park currently lies used to be occupied by parkland, rail yards and parking lots. For sure, it is better to leave future generations a field full of green living things than tones of concrete.
When it comes to focus in specific aspects of the park that you notice that are sustainable or that promote sustainability, the task turns into a hard one. I have found just three :
- The Exelon Pavilions, that are certificated as sustainable. All the apparently mirrors that cover the buildings, are in fact solar panels.

- McDonald's Cycle Center. A place to hire a bicycle to ride not only the park but the city too.
- Some bins to recycle waste.