Soloman Howard performs as Dr. Martin Luther King, Jr. in Philip Glass and Christopher Hampton's Appomattox. Scott Suchman for WNO hide caption

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The Svalbard Global Seed Vault was opened on Feb. 26, 2008. Carved into the Arctic permafrost and filled with samples of the world's most important seeds, it's a Noah's Ark of food crops to be used in the event of a global catastrophe. AFP/Getty Images hide caption

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Army Sgt. 1st Class Joshua Gendron carries the remains of Army Sgt. Charles Schroeter, who was awarded the Medal of Honor for gallantry in an 1869 battle during the Indian Wars. Chris Carlson/AP hide caption

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A cypress tree swamp in Byrnes Lake, part of the more than 200,000-acre Mobile delta. It's the most biologically diverse river delta system in the country. Debbie Elliott/NPR hide caption

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Protesters close their eyes in silent prayer as they stand on the South Carolina Statehouse steps during a rally to take down the Confederate flag, Saturday, June 20, 2015, in Columbia, S.C. Rainier Ehrhardt/Associated Press hide caption

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Courtesy of Amistad

An African-American Army cook at work in City Point, Va., sometime between 1860 and 1865. Food played a critical role in determining the outcome of the Civil War. Library of Congress hide caption

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The ill-fated Sultana in Helena, Ark., just before it exploded on April 27, 1865, with about 2,500 people aboard. Most were Union soldiers, newly released from Confederate prison camps. Library of Congress hide caption

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Re-enactors re-create the Battle of Appomattox Court House as part of the 150th anniversary of the surrender of the Army of Northern Virginia at Appomattox Court House. Steve Helber/AP hide caption

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Daniel Majook Gai from South Sudan goes in and out of his war-torn country to help children there go to school. Courtesy of Project Education South Sudan hide caption

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1st Lt. Alonzo Cushing, shown in an undated photo provided by the Wisconsin Historical Society, is expected to get the nation's highest military decoration --€” the Medal of Honor --” this summer, nearly 150 years after he died at the Battle of Gettysburg. Wisconsin Historical Society/AP hide caption

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Waverly Adcock, a sergeant and founder of the West Augusta Guard, prepares his company for inspection and battle at a Civil War re-enactment in Virginia. Sara Smith, whose great-great-grandfather was wounded at the Battle of Gettysburg, holds the Confederate battle flag. Courtesy of Jesse Dukes hide caption

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