The Polyforum Cultural Siqueiros is a cultural, political and social facility located in Mexico City as part of the World Trade Center Mexico City. It was designed and decorated by David Alfaro Siqueiros in the 1960s and hosts the largest mural work in the world called “La Marcha de la Humanidad.” The building has a theatre, galleries and more, but the main focus is the Forum Universal, which contains the interior portion of Siqueiros' mural work.