Watch Garden Travels: Green Chicago and Millennium Park

Garden Travels: Green Chicago and Millennium Park is a documentary about two green projects in Chicago. The first project is the green roof on City Hall. It's a rooftop garden that was installed in 2000 to test the effectiveness of rooftop gardens in improving air quality and reducing temperatures in cities. Rooftop gardens also help conserve energy. Millennium Park, which opened in 2004, was constructed on top of a railroad yard and several parking garages, making it one of the largest green roofs in the world.