A glass pyramid covers the remains of African slaves at the home of Ana de la Merced Guimaraes in Rio de Janeiro, Brazil.

In 1996, Merced Guimaraes and her husband bought a fixer-upper in the historic port-side neighborhood of Gamboa. Once they started digging into the foundation, they made a startling discovery: the building sat atop the "cemetery of new blacks," - the burial place of newly arrived Africans who died soon after their arrival in Brazil between 1769 and 1830.

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