A worker releases two red parrot cichlid fish in a tank in a fish farm in Pingtung, Taiwan, on Thursday. Pichi Chuang/Reuters
A newspaper seller holds souvenir bags to mark the pope's visit to Britain which contain a bottle of water and a snack and are given free to those who purchase the national newspaper on a street close to Bellahouston Park, Glasgow, Scotland, on Thursday. Pope Benedict XVI arrived in the United Kingdom for a four-day visit, a controversial yet historic state trip that has been overshadowed by the sex abuse scandals that have shaken confidence in the Roman Catholic Church. Scott Heppell/AP
Mexican artists perform a folk dance during Mexico's Pavilion Day on Thursday in Shanghai, China, at the Shanghai Expo site. Eugene Hoshiko/AP
An Indian male ring neck parrot tries to break the padlock of its cage in Calcutta, India, on Thursday. Bikas Das/AP
A large-scale video installation is projected onto Rome's ancient Colosseum by artists Thyra Hilden and Piuz Diaz on Thursday. "City on Fire" is a series of large-scale video projections simulating fire burning down symbolic monuments in the Western world. Alessandro Bianchi/Reuters
A French soldier patrols at the Eiffel Tower in Paris on Thursday as France faces an elevated threat of terrorism. France's Interior Minister, Brice Hortefeux, pointed to the kidnapping of five French nationals in Africa overnight and a bomb alert Tuesday that led to the evacuation of the Eiffel Tower as the causes of the heightened alert. Francois Mori/AP
Riot police stand guard along the streets of Paquisha, Ecuador, on Thursday. Miners gathered to protest against President Rafael Correa's policies on illegal mining in Ecuador. Guillermo Granja/Reuters
A man cheers while standing in Zocalo Square as Mexico marks the 200th anniversary of its independence in Mexico City. Eliana Aponte/Reuters
Winds play havoc with a woman's umbrella in downtown Erie, Penn., on Thursday. Rob Engelhardt/Erie Times-News/AP
Models display creations by Lebanese international designer Elie Saab during her Autumn-Winter 2010-2011 fashion show at the official opening of "Beirut Souks" a gigantic shopping mall in downtown Beirut, Lebanon, on Thursday. Hussein Malla/AP
For years, many Brazilians have argued that the country's story of slavery is buried out of sight – literally, in Rio de Janeiro, once home to the Americas' biggest slave port. The Museum of Yesterday, an augmented reality app, tries to put that history in users' hands.
ByAnna Jean Kaiser, Contributor
Just as rush hour begins in Rio de Janeiro’s Port Zone, bordering the city’s bustling downtown, Gabriele Roza looks kitty-corner across a busy street. Between buses and taxis rushing through the intersection, she points to a small plaza: half a dozen buildings fan out, all tagged with graffiti and some with broken windows. They’re a reminder of the city’s uncomfortable history – although there’s no way to tell at first glance.