Spiral Jetty (Robert Smithson), Lightning Field (Walter de Maria), Sun Tunnels (Nancy Holt), Double Negative (Michael Heizer)—these are works by artists who, beginning in the late 60s, broke free of the New York gallery scene for the open expanses of the American Southwest, where the earth itself became their medium. Filmmaker James Crump recaptures the liberating spirit of the time and uses his camera to give rare visual perspectives on the art, from stunning aerial shots to deep plunges inside ancient stratified landscapes. A “cogent, brisk, sometimes thrilling documentary” (The New York Times).