An aerial view of Monticello shows Mulberry Row to the right of Thomas Jefferson's house. Robert Llewellyn/© Thomas Jefferson Foundation at Monticello hide caption

itoggle caption Robert Llewellyn/© Thomas Jefferson Foundation at Monticello

Thai and Burmese fishing boat workers sit inside a cell at the compound of a fishing company in Benjina, Indonesia on Nov. 22, 2014. The imprisoned men were considered slaves who might run away. Dita Alangkara/AP hide caption

itoggle caption Dita Alangkara/AP

Interior view of a room with a rotunda ceiling during an auction of slaves, artwork and goods. William Henry Brooke, 1772-1860/Courtesy of The Historic New Orleans Collection hide caption

itoggle caption William Henry Brooke, 1772-1860/Courtesy of The Historic New Orleans Collection

Coates with his son Samori. Random House hide caption

itoggle caption Random House

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

itoggle caption Library of Congress

Underwater archaeology researchers explore the site of the São José slave ship wreck near the Cape of Good Hope in South Africa. Susanna Pershern/Courtesy of U.S. National Parks Service hide caption

itoggle caption Susanna Pershern/Courtesy of U.S. National Parks Service

The new African Burying Ground Memorial Park was dedicated on Saturday in Portsmouth, N.H. Emily Corwin/NHPR hide caption

itoggle caption Emily Corwin/NHPR

Whitney Plantation owner John Cummings has commissioned stark artwork for the site, including realistic statues of slave children found throughout the museum. Debbie Elliott/NPR hide caption

itoggle caption Debbie Elliott/NPR

Burmese migrant Thazin Mon Htay and her father Ko Ngwe Htay were trafficked to Thailand to peel shrimp. They worked 16-hour shifts, seven days a week, for less than $10 a day, Ko Ngwe told PBS NewsHour. Jason Motlagh/Pulitzer Center on Crisis Reporting for NPR hide caption

itoggle caption Jason Motlagh/Pulitzer Center on Crisis Reporting for NPR

Great Dismal Swamp, in Virginia and North Carolina, was once thought to be haunted. For generations of escaped slaves, says archaeologist Dan Sayers, the swamp was a haven. U.S. Fish and Wildlife Service hide caption

itoggle caption U.S. Fish and Wildlife Service

Louis E. Pratt, master ivory cutter for Pratt, Read & Co., shows off eight ivory tusks, April 1, 1955. Courtesy of Deep River Historical Society hide caption

itoggle caption Courtesy of Deep River Historical Society

A pedestrian walks along Lambeth Road in south London on Friday. Police have rescued three women from a home in the neighborhood. They were held hostage for some 30 years, according to authorities. Andy Rain/EPA/Landov hide caption

itoggle caption Andy Rain/EPA/Landov