The Spiral Jetty, considered to be the central work of American sculptor Robert Smithson, is an earthwork sculpture constructed in 1970.
Built 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 1500-foot long and 15-foot wide counterclockwise coil jutting from the shore of the lake.
It is currently threatened by oil drilling.
Source: Wikipedia via Boing Boing
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