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In this July 6, 2017 photo, the "Museum of Yesterday" app is seen on a cell phone showing information on slave deposits in the late 18th century, in Rio de Janeiro, Brazil. Before abolishing slavery in 1888, becoming the last country in the Americas to do so, Brazil was the world's largest slave market. The new app seeks to educate visitors about the history and role of Rio de Janeiro’s revitalized port in colonization, slavery and even recent corruption investigations.(AP Photo/Renata Brito)

In this July 6, 2017 photo, the "Museum of Yesterday" app is seen on a cell phone showing information on slave deposits in the late 18th century, in Rio de Janeiro, Brazil. Before abolishing slavery in 1888, becoming the last country in the Americas to do so, Brazil was the world's largest slave market. The new app seeks to educate visitors about the history and role of Rio de Janeiro’s revitalized port in colonization, slavery and even recent corruption investigations.(AP Photo/Renata Brito)

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