Robert Smithson's 1970 earthwork coils more than 1,500 feet into the Great Salt Lake from black basalt shoreline. Water level changes can leave the spiral submerged, exposed or surrounded by pinkish salt water.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: diaart.org/visit/visit-our-locations-sites/robert-smithson-spiral-jetty