File--In this Aug. 1, 1972, file photograph, part of an art installation by Christo Javacheff, which weighted six tons and cost of $750,000, hangs for a quarter mile over the Rifle Gap near the small western slope community of Rifle, Colo. Christo, who has been planning to drape a similar curtain across the Arkansas River in southern Colorado, announced on Wednesday, Jan. 25, 2017, that he has abandoned the effort. (AP Photo/file)