The third American health worker to contract the Ebola virus in Liberia was an obstetrician at the ELWA hospital, which is run by the missionary group SIM. Ahmed Jallanzo/EPA/Landov hide caption

itoggle caption Ahmed Jallanzo/EPA/Landov

Gravel helps keep the floor level and prevents moisture from seeping up. The floor installers are Jean Pierre (left), a mason, and Daniel Shenyi, operations manager for EarthEnable. Courtesy of EarthEnable hide caption

itoggle caption Courtesy of EarthEnable

American journalist Steven Sotloff (left) talks with Libyan rebels on the Al Dafniya front line on June 2, 2011, in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria. Etienne de Malglaive via Getty Images hide caption

itoggle caption Etienne de Malglaive via Getty Images

The Arirang mass festival re-enacts the history of North Korea. The flag depicted in the background was created by audience members holding up cards. Julia Leeb/teNeues hide caption

itoggle caption Julia Leeb/teNeues

A man walks past burnt vehicles near a railway station after recent shelling in Donetsk, eastern Ukraine, Aug. 29. Maxim Shemetov/Reuters/Landov hide caption

itoggle caption Maxim Shemetov/Reuters/Landov