LONG ISLAND AT WAR (Long Island Museum of American Art, History & Carriages, 1200 Rte. 25A, Stony Brook, through Dec. 28). From the Setauket spy ring now featured in the AMC series "Turn" to Grumman's "arsenal of democracy" and the final resting place for today's fallen warriors -- Calverton is the nation's largest national cemetery -- Long Island's role in every major conflict in American history is traced through art and artifacts. 631-751-0066, longislandmuseum.org.
PIN RIVER -- SANDY (Parrish Art Museum, 279 Montauk Hwy., Water Mill, July 4-Oct. 13). Maya Lin, best known for designing the Vietnam Memorial in Washington, D.C., creates a geographic installation depicting superstorm Sandy's flood plain through the arrangement of thousands of straight pins. Three new and recycled works in silver representing East End bodies of water -- Accabonac Harbor, Georgica Pond and Mecox Bay -- also will be displayed, along with Lin's marble sculptures "Arctic Circle," "Latitude New York City" and "Equator." 631-283-2118, parrishart.org.
STILL LIFE: 1970s PHOTO REALISM (Nassau County Museum of Art, 1 Museum Dr., Roslyn Harbor, July 19-Nov. 9). Works by Audrey Flack, Ralph Goings, Malcolm Morley and others represent the 1970s trend in which painters and sculptors used photography to re-create scenes and figures with surprising and sometimes surreal accuracy. 516-484-9337, nassaumuseum.org.
WILLIAM GLACKENS (Parrish Art Museum, 279 Montauk Hwy., Water Mill, July 20-Oct. 13). This long-overdue retrospective of 75 works from private collections, leading American museums and Philadelphia's Barnes Foundation features Glackens' paintings of Bellport Harbor and other scenes depicted in his then-radical Modernist style, from the 1890s to the 1930s. 631-283-2118, parrishart.org.
ROBERT MOTHERWELL: THE EAST HAMPTON YEARS, 1944-1952 (Guild Hall, 158 Main St., East Hampton, Aug. 9-Oct. 13). "I did my best work there," Motherwell once said of his Hamptons period. Sixteen paintings from major museums and three private collections -- all created in his East Hampton home/studio -- show a different side of this Abstract Expressionist pioneer. 631-324-0806, guildhall.org.
DON RESNICK: ESSENCE OF PLACE (Hofstra University Museum of Art, Emily Lowe Gallery, Hempstead, through Aug. 15). Influenced by his studies with Raphael Soyer and Oscar Kokoshka, Resnick's Long Island landscapes and seascapes and scenes from his family's Maine retreat convey the delicate beauty of nature. 516-463-5672, hofstra.edu/museum.
47TH ANNUAL ART IN THE PARK FINE ART & CRAFT FAIR (Heckscher Park, Huntington, Saturday-June 1). The Art League of Long Island's show and sale traditionally marks the opening of the outdoor exhibition season, this time with works by more than 75 artists and artisans. 631-462-5400, artleagueli.net.
FOUNDATION FOR ART AND PRESERVATION IN EMBASSIES (Guild Hall, 158 Main St., East Hampton, June 21-July 27). Travel the world through art in an exhibition featuring works by leading American artists represented in FAPE's print, photography and site-specific collections. 631-324-0806, guildhall.org.
MASH UP: COLLAGES IN MIXED MEDIA (Islip Art Museum, 50 Irish Lane, East Islip, June 29-Sept. 14). It's been a little more than a century since Picasso and Braque started experimenting with collages, then a brand-new art form. This show puts a mixed-media twist on that now-traditional genre. 631-224-5402, islipartmuseum.org.
ART HAMPTONS (Sculpture Fields of Nova's Ark, Bridgehampton, July 10-13). Long Island's richest art show and sale will honor Jane Freilicher and Robert Wilson with lifetime achievement and arts patron of the year awards, respectively. 631-283-5505, arthamptons.org.
RICHARD GACHOT'S AMERICA (Heckscher Museum of Art, 2 Prime Ave., Huntington, Aug. 16-Nov. 23). Gachot, whose witty sculptures using objects found all across Long Island, is the Heckscher's "Celebrate Achievement" honoree for 2014. 631-351-3250, heckscher.org.