Exploring the West's land sculptures -- made by artists and industry

  • Spiral Jetty: Sometimes you see it, sometimes you don't.

    Steven R. Harris
  • The Roden Crater by James Turrell (under construction since 1979 in the Arizona desert).

    © Ted Soqui/Corbis
  • Workmen stand near the draped 340-ton granite rock that would become the centerpiece of Michael Heizer's newest installation, Levitated Mass. Heizer conceived of the work in the 1960s -- around the time of his Double Negative -- but wouldn't find the right rock until decades later

    © Ted Soqui/Corbis
  • Stills from the 1968 film Mono Lake, shot by Smithson, Heizer and Holt on a trip West.

  • Benches and dump trucks at the Bingham Canyon Mine near Salt Lake City, which fascinated Robert Smithson.

    Jonathan Thompson
  • ATK rocket garden on the route to Spiral Jetty.

    Jonathan Thompson
  • Bob Phillips, the foreman of the crew that actually built the Spiral Jetty, tells his story to a group of art historians and architects from Switzerland.

    Jonathan Thompson
  • Approaching Sun Tunnels, by Nancy Holt.

    Jonathan Thompson
  • A highway underpass on a back route to Michael Heizer's Double Negative mirrors the sculpture.

    Jonathan Thompson
  • Double Negative as it appears today.

    Jonathan Thompson
  • Spider encountered while the author was searching for Double Negative.

    Jonathan Thompson
  • Industrial West salt flats gas station

    Jonathan Thompson