Looking to catch some fall color earlier in the season? This 2.5-acre landscape in the midst of Millennium Park (just south of the Pritzker Pavilion's Great Lawn) turns into a fiery prairie come September. The lush garden fills with colorful fall blooms like balloon flowers, black-eyed Susans and Moonshine Yarrow. Before you leave, snap a photo from the footbridge, where you can see vibrant layers of foliage set against the city skyline.