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In this July 9, 2017 photo, tourists read an information sign at the Valongo Wharf where hundreds of thousands of enslaved Africans debarked from their harrowing journey across the Atlantic, in Rio de Janeiro, Brazil. The archeological pit was named a UNESCO world heritage site but tourists complain there is little information about it available on street signs. A new app called “Museum of Yesterday” 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 9, 2017 photo, tourists read an information sign at the Valongo Wharf where hundreds of thousands of enslaved Africans debarked from their harrowing journey across the Atlantic, in Rio de Janeiro, Brazil. The archeological pit was named a UNESCO world heritage site but tourists complain there is little information about it available on street signs. A new app called “Museum of Yesterday” 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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