Spiral Jetty.
The Spiral Jetty, constructed in 1970 by sculptor Robert Smithson, is one of the most iconic Earthwork sculptors.
Built entirely of mud, salt crystals, basalt rocks, earth, and water on the northeastern shore of the Great Salt Lake near Rozel Point in Utah, it forms a 1,500-foot-long (460 m), 15-foot-wide (4.6 m) counterclockwise coil jutting from the shore of the lake which is only visible when the level of the Great Salt Lake falls below an elevation of 4,195 feet (1,279 m).
At the time of its construction, the water level of the lake was unusually low because of a drought. Within a few years, the water level returned to normal and submerged the jetty for the next three decades.
The water level in the lake continues to fluctuate however, we were lucky to have to opportunity to see it while water levels were low.