Location: Emmen, Holland
Year: 1971

Broken Circle/Spiral Hill is Robert Smithson's only Land Art work in Europe. Visitors to the site walk through a sand quarry to the artwork. While many earthworks don't last, this piece has been restored and is also preserved Nancy Holt's film Breaking Ground: Broken Circle/Spiral Hill (1971–2011), which is screened for visitors to Smithson's site.