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This photo shows rocks that have moved across a dry lake bed in Death Valley National Park in California's Mojave Desert. For years scientists have theorized about how the large rocks ó some weighing hundreds of pounds ó zigzag across Racetrack Playa leaving long trails etched in the earth.

AP

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A visitor looks at the traveling Vietnam Wall, now set up in Ludington City Park, in Ludington, Mich.

Jeff Kiessel/AP

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A Pro-Russian separatist stands near the damaged war memorial at Savur-Mohyla, a hill east of the city of Donetsk.

MAXIM SHEMETOV/REUTERS

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Serena Williams of the U.S. hits a return to compatriot Vania King at the 2014 U.S. Open tennis tournament in New York.

MIKE SEGAR/REUTERS

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Rescue workers search the site of a landslide in Fuquan, Guizhou province. According to Xinhua News Agency, at least seven people were killed in the landslide and 20 remained missing.

CHINA DAILY/REUTERS

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Tianna Bartoletta of the U.S. competes in the women's long jump event during the Weltklasse Diamond League meeting at the Letzigrund stadium in Zurich.

RUBEN SPRICH/REUTERS

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Paramilitary police officers hold the Chinese national flag in a flag-raising ceremony during the closing ceremony of the 2014 Nanjing Youth Olympic Games in Nanjing, Jiangsu province.

ALY SONG/REUTERS

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Serena Williams, of the United States, pauses before serving against Vania King, of the United States, during the second round of the 2014 U.S. Open tennis tournament.

Elise Amendola/AP

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