In this Sept. 11, 2012 photo, Ana de la Merced Guimaraes points to remains of African slaves covered with a glass pyramid at her home in Rio de Janeiro, Brazil. In 1996, Merced Guimaraes and her husband Petrucio 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. (AP Photo/Silvia Izquierdo)
