The Art at the End of the WorldA pilgrimage (with children) to see ‘‘Spiral Jetty,’’ Robert Smithson’s profound testament to catastrophe. By HEIDI JULAVITS JULY 7, 2017 The New York Times Magazine We were taking an airplane, I told our children, to see what I dramatically billed as ‘‘the end of the world.’’ ‘‘Can’t we go to a beach?’’ they asked. It ..