An Oct. 28, 1985 photo of John A. Walker Jr., being escorted by a federal marshal as he leaves the Montgomery County Detention Center in Rockville, Md., enroute to a federal court in Baltimore. He was ultimately sentenced to life in prison on espionage charges. Bob Daugherty/AP hide caption

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President of Ukraine Petro Poroshenko (left) and EU Commission President Jose Manuel Barroso during a news conference after a meeting at the EU Commission headquarters in Brussels on Saturday to discuss the crisis in eastern Ukraine. Julien Warnand/EPA/Landov hide caption

itoggle caption Julien Warnand/EPA/Landov

Hadrian's Wall marks the Roman Empire's northernmost boundary, and at one point is less than a mile from today's border between England and Scotland. Ari Shapiro/NPR hide caption

itoggle caption Ari Shapiro/NPR

Mario Moreno, known as Cantinflas, is a beloved icon in Latin America. A new biopic about the comic opens this weekend in the U.S. AFP/Getty Images hide caption

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Peter Piot was one of the co-discoverers of the Ebola virus in 1976. "I never thought we would see such a devastating and vast epidemic," he says. Leon Neal/AFP/Getty Images hide caption

itoggle caption Leon Neal/AFP/Getty Images