The Roden Crater by James Turrell (under construction since 1979 in the Arizona desert).
(image 2 of 12)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
(image 3 of 12)Stills from the 1968 film Mono Lake, shot by Smithson, Heizer and Holt on a trip West.
(image 4 of 12)Benches and dump trucks at the Bingham Canyon Mine near Salt Lake City, which fascinated Robert Smithson.
(image 5 of 12)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.
(image 7 of 12)A highway underpass on a back route to Michael Heizer's Double Negative mirrors the sculpture.
(image 9 of 12)Spider encountered while the author was searching for Double Negative.
(image 11 of 12)