In this 1997 photo released by the International Fund for Animal Welfare, a seal hunter, right, threatens a cameraman with a knife during the filming of a seal hunt in the Gulf of St. Lawrence, Canada. “Huntwatch”, a documentary by the organization about the fight to end commercial seal hunts, premieres in September 2016 on Discovery. The producers say it includes grainy but powerful archive footage that had languished in the basement of the group’s headquarters on Cape Cod for nearly five decades. (Photo by Richard Sobol/IFAW via AP Photo)





Woman Holds Off a Mob, Atlanta, 1963. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





At Pushkin Squarein Moscow, Russia, 1990s. (Photo by Valeriy Gende-Rote)





This November 6, 1987 file photo shows an 11-foot sturgeon, weighing nearly a half-ton, found dead in Seattle's Lake Washington, near Kirkland, Wash. In the area, tales have long persisted of a huge, duck-eating “monster”. A member of this bottom-feeder fish species is reported to have lived to be 152. (Photo by Jim Bates/AP Photo)





Leslie, Downtown Knoxville, 1967. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





In this September 12, 1980 file photo, a military tank is stationed at the center of Kizilay, Ankara's main square, a few hours after a coup d'etat. (Photo by Burhan Ozbilici/AP Photo)





In this October 29, 1980 file photo, the leaders of Sept. 12 military coup, from left to right, Adm. Nejat Tumer, Gen. Nurettin Ersin, Gen. Kenan Evren, Gen. Tahsin Sahinkaya and Gen. Sedat Celasun stand during a ceremony at the mausoleum of the founder of modern Turkey, Kemal Ataturk, in Ankara, Turkey. (Photo by Burhan Ozbilici/AP Photo)





At night on Kalinin Prospekt in Moscow, Soviet Union, 1960s. (Photo by Victor Akhlomov)





Rioter hurls rock at riot police patrol during Mid-May riots in Hong Kong, May 1967. (Photo by AP Photo)





Knoxville, Tennessee, 1967. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





Mary, Santa Marta, Colombia, 1972. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





A Turkish soldier stands guard near tanks and armoured vehicles paraded through the main street of Sincan, a district near capital Ankara, Turkey, in this file photo taken on February 4, 1997. (Photo by Reuters/File photo)





A Turkish tank is followed by an armoured vehicle as around 20 tanks and armoured carriers parade through the streets of the Sincan district, near the capital Ankara, Turkey, in this file photo taken on February 4, 1997. (Photo by Reuters/File photo)





Ajijic, Jalisco, Mexico, 1983. (Photo by Alex Webb/Magnum Photos)





Yvon Rainville drinks coffee on the CN Tower, one of Canada’s landmarks, 26 September 1973. (Photo by Boris Spremo/Toronto Star via Getty Images)





“New times in Moscow”; Soviet Union, 1980s. (Photo by Valeriy Gende-Rote)





Children playing on an abandoned tank in Kabul, Afghanistan, 1996. (Photo by James Nachtwey/Boston Museum of Fine Arts)





Photographer Vsevolod Tarasevich shooting from a helicopter over Leningrad, Soviet Union, 1960s. (Photo by Oleg Makarov)





Children at a soda machine in Moscow, Soviet Union, 1950s. (Photo by Dmitry Baltermants)





Marc Riboud’s image of a young US girl, Jan Rose Kasmir, outside the Pentagon during an anti-Vietnam march, 1967. (Photo by Marc Riboud/Magnum Photos)





Crossing the Ohio River, Louisville, 1966. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





Unconventional bike ride – Fred Hagstrora rides a bicycle into the crystal clear waters off the dock on Fort Jefferson in the Dry Tortugas on August 14, 1981. The island fort is now a historical monument staffed by employees of the National Park Service and used by scientists such as Mr. Hagstrom, who spent a grueling day trying to tag sea turtles for research purposes. The bicycle jump is one way for the island's residents to cool off after a day of work. (Photo by New York Post/Photo Archives, LLC via Getty Images)





Annual butterfly census was taken in the greater New York are by the National Park service at various gateway National Park locations in Queen, Bklyn, Staten Island and Sandy Hook, NJ. on September 07, 1992. Shown here is Jamaica Bay mildlife refuge's chief ranger Don Riepe, wielding his butterfly net, exhibiting a monarch butterfly (one is counted, the other is live and being shown to Nicholas Kobe, 10, of Naspethe). Volunteers around the city assistant in census, now in its seventh year. (Photo by Ralph Ginzburg/New York Post/Photo Archives, LLC via Getty Images)





Fallen Giant. Visitors sit atop a redwood in Sequoia National Park while a truck passes through the tunnel burrowed in its trunk after the 275-foot giant fell across the road in 1937, in a scene from America's Wonderlands – The National Parks/1 first National Geographic Society special of the season, Wednesday, October 23 October 04, 1968. (Photo by New York Post/Photo Archives, LLC via Getty Images)





Dangerous Beggars. Mother bear in Yellowstone National Park walks away from cars at roadside, but her cubs look for a handout. Although it's forbidden by Federal Law, thousands of tourists each year stop to feed the bears, and each year 50 to 100 wind up with scratches or teeth marks on their face and hands. September 09, 1968. (Photo by New York Post/Photo Archives, LLC via Getty Images)





People run from the collapse of World Trade Center Tower Tuesday, September 11, 2001 in New York. (Photo by Suzanne Plunkett/AP Photo)





Occupy demonstration on Broadway, Los Angeles, 2011. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





In this August 19, 1991 file photo, crowds of people surround and climb on tanks which were stopped by the crowd as they drove towards the Red Square area of Moscow, Russia, during a military coup after the announced ousting of Mikhail Gorbachev from power. In these critical days when Muscovites turned out to defend the spirit of democracy that Gorbachev had unleashed, and many Soviet officers defied their orders and sided with the people, ensuring that that the plotters failed. (Photo by Boris Yurchenko/AP Photo)





John Lennon and Danny Seymour, The Bowery, New York, 1969. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





Haiti, 1987. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





Racer, Schererville, Indiana, 1965. (Photo by Danny Lyon/Edwynn Houk Gallery, New York)





Jacqueline Kennedy and Bobby Kennedy are escorted off Air Force One to the waiting Navy ambulance in Washington D.C. November 22, 1963. (Photo by Fred Ward/Award Agency)





British rock group the Beatles performing their last live public concert on the rooftop of the Apple Organization building for director Michael Lindsey-Hogg's film documentary, “Let It Be”, on Savile Row, London, England, 30th January 1969. Drummer Ringo Starr sits behind his kit. Singer/songwriters Paul McCartney and John Lennon perform at their microphones, and guitarist George Harrison (1943 - 2001) stands behind them. Lennon's wife Yoko Ono sits at right. (Photo by Express/Express/Getty Images)