For those who have toured the FDR exhibits around town -- a far-flung assortment of portraits, New Deal mural studies, cartoons and photographs, along with his cigarette holder -- there are alternatives: a couple of interesting photo shows and six exhibits relating to black history. This being Black History Month, Martin Luther King Library offers "Africa and Africans: Here, There and Elsewhere," paintings by Joseph Holston and photographs by Samuel F. Yette, through March 5 in gallery A-6. Lansburgh's hosts the Evans-Tibbs Collection of "Black History Through Artists' Eyes," in window showcases at 418 Seventh Street NW. Also on view are 47 sometimes dizzying works by the late Washington Colorist, Alma Thomas, in a retrospective at the National Museum of American Art. Touching on both FDR and Black History Month, the Anacostia Neighborhood Museum exhibits "Mary McLeod Bethune and Roosevelt's 'Black Cabinet' " through May 3. And the Mary McLeod Bethune Memorial Museum features "NCNW 1935-1980," photographs, documents and artifacts tracing the history of the black women's organization from its founding by Bethune. Included are photographs and correspondence of Bethune with Franklin and Eleanor. The Corcoran's massive and compelling "Black Folk Art in America, 1930-1980," continues through March 28, featuring 400 tin cut-outs, found-object sculpture, religious and otherwise curious works. For extra flights of fancy, families are invited to Whirligig Day on Saturday: four workshops in making toys that move with the wind. All materials will be provided at $3 per whirligig. Call the Corcoran at 638-3211, extension 45, for registration. Students of photography or just good scenery should note the 75 "Images of the World" at the National Geographic Society's Explorers Hall, on view through May. To see pictures by such photography greats as Alfred Stieglitz, Edward Steichen, Clarence White, Samuel Bourne, Julia Margaret Cameron and Henry Fox Talbot, you may want to trek to the Baltimore Museum's show of "Treasures of the Royal Photographic Society," where 100 such works are on display through February.