Millennium Park is a public park located in the Chicago Loop community area of Chicago within Cook County, Illinois, United States. It is a prominent civic center of the City of Chicago's Lake Michigan lakefront. In 2004, a 24.5-acre (9.9 ha) section of northern Grant Park, previously occupied by Illinois Central railyards and parking lots, was built over and redeveloped as Millennium Park. The park is bounded by Michigan Avenue, Randolph Street, Columbus Drive and East Monroe Drive. Planning began in October 1997, construction began in October 1998 and was completed in July 2004. Millennium Park, which has become the world's largest rooftop garden, was opened in a ceremony on July 16, 2004, as part of a three-day celebration that included an inaugural concert by the Grant Park Orchestra and Chorus. 300,000 people took part in the grand opening festivities. The park's design and construction won awards ranging from accessibility to green design. Since then, Millennium Park has become a major tourist destination for Chicago. Admission to the park is free. The park features the Cloud Gate, Crown Fountain, Jay Pritzker Pavilion, Lurie Garden and other attractions. The park is connected by bridges to other parts of Grant Park (BP Pedestrian Bridge, Nichols Bridgeway).