The 2.7-mile urban greenway is the most adventurous thing to happen to Chicago’s public art scene since Millennium Park. Kay Rosen’s graphic repurposed billboard art; a graffiti garden with 78 murals; a solar observatory created from spiraling mounds of earth; Chakaia Booker’s scrap tire sculptures. What’s not to love? And this is just the beginning: Just like a museum, the 606 will feature rotating exhibits.