BIG SKY COUNTRY An exhibit of 19th century American mammoth plate photographs features the work of Carleton Watkins, William Henry Jackson, and Frank Jay Haynes. The photographs on display in “Celebrating the American West” were taken with cameras that held glass negatives as large as 18 inches by 22 inches. They depict Western scenes including Yellowstone and Yosemite. Through Saturday, April 29, Wednesday-Saturday, 11 a.m.-6 p.m., Gitterman Gallery, 170 E. 75th St., between Third and Lexington avenues, 212-734-0868, free.

FUTURE IMPERFECT Mary Mattingly’s digitally manipulated photographs are on display in “Second Nature.” Their subject matter is “the distant future of the human race.” In her imagined future, industrial civilization has fallen and people live as nomads, wearing their homes on their backs like snails. Forced to scavenge for scarce natural resources, the figures in this landscape are cut off from each other. Ms. Mattingly creates these scenes by first sewing costumes, designing machinery, and posing the characters in each scene. The resulting photographs are tweaked digitally to create the final products on display. Through Saturday, February 25, Tuesday-Saturday, 11 a.m.-6 p.m., Robert Mann Gallery, 210 Eleventh Ave., between 24th and 25th streets, 212-989-7600, free.

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