September 2002, Utah, USA, USA — Spiral Jetty by Robert Smithson is a 1970 earthworks sculpture of a 1,500 foot long spiral made of 6,650 tons of black basalt. A prolonged drought has lowered lake levels to the point where this once-submerged artwork has come back to the surface encrusted in salt. — Image by © George Steinmetz/Corbis
