The Spiral Jetty

Spiral Jetty is an earthwork sculpture constructed in April, 1970 on the northeastern shore of the Great Salt Lake near Rozel Point in Utah. The sculpture is built of mud, precipitated salt crystals, basalt rocks, and water. The sculpture forms of a 1,500-foot-long, 15-foot-wide counterclockwise coil jutting from the shore of the lake. The sculpture is sometimes visible and sometimes submerged, depending upon the water level of the Great Salt Lake. Originally black basalt rock against ruddy water, Spiral Jetty is now largely white against pink due to salt encrustation.

Source: Wikipedia