The Manhattan High Line started as an elevated freight railway in the 1930s. After falling into disuse in the 1980s, two local residents fought to transform it into a public park. They founded Friends of the High Line to advocate for preservation and redevelopment. After overcoming political and legal hurdles, the group secured funding and support. Construction began in 2005 and the first section of the High Line park opened in 2009, now receiving over 4 million visitors annually.