Caption

U.S. President Barack Obama (L) shakes hands with Chinese President Xi Jinping (R) after a joint press conference at the Great Hall of People on November 12, 2014 in Beijing, China. (Feng Li/Getty Images)

Caption

General view of the escalators at Comuna 13 neighborhood in Medellin, Antioquia department, Colombia on December 26, 2011, the day of their inauguration. (RAUL ARBOLEDA/AFP/Getty Images)

Caption

(JERRY LAMPEN/AFP/Getty Images)

Caption

(Chris Hondros/Getty Images)

Caption

Ultra Orthodox Jews look at bullet holes in the main window of a synagogue in Jerusalem, November 19, 2014. (THOMAS COEX/AFP/Getty Images)

Caption

(WILLIAM WEST/AFP/Getty Images)

Caption

(Lukas Coch- Pool/Getty Images)

Caption

Pipe is stacked at the southern site of the Keystone XL pipeline on March 22, 2012 in Cushing, Oklahoma. (Tom Pennington/Getty Images)

Caption

(Joe Raedle/Getty Images)