President Barack Obama and First Lady Michelle Obama surprise White House tourists in the Blue Room.
Pete Souza/White House
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Switzerland's Roger Federer celebrates after defeating France's Jo-Wilfried Tsonga in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.
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A Commuter bundles up against extreme cold conditions in Chicago. Temperatures in the area were hovering around zero with sub-zero wind chill reading hitting 10 below.
M. Spencer Green/AP
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Firefighters pour water on the smoldering remains of a warehouse in Chicago after an overnight fire destroyed the building. Officials say it's one of the largest fires in the city in recent years. More than 170 firefighters responded to the five-alarm blaze.
M. Spencer Green/AP
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A person places a candle during a vigil honoring Penn State football coach Joe Paterno on the first anniversary of his death on Jan. 22, 2013, in State College, Pa.
Gene J. Puskar/AP
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Beijing residents wear masks to protect from severe pollution in Beijing, China, as smog blanketed the city.
Feng Li/Getty Images
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A worker looks over the balcony of the new annexe of Liverpool Central Library in England. After ten years of planning and more than two years of restoration, Liverpool’s Central Library is almost ready for its official opening in May.
Christopher Furlong/Getty Images
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Amy Poehler speaks on the set of the Best Buy's Super Bowl commercial. The commercial war is on as companies film spots to air during Super Bowl XLVII.
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Models wait backstage prior to the Valentino Spring Summer 2013 Haute Couture fashion collection presented in Paris.
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A boy who fled northern Mali is seen at a camp for internally displaced persons in the city of Sevare, Mali.
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U.S. Secretary of State Hillary Clinton prepares to testify before the Senate Foreign Relations Committee on Capitol Hill. Lawmakers questioned Clinton about the security failures during the September 11 attacks against the U.S. mission in Benghazi, Libya, that led to the death of four Americans, including U.S. Ambassador Christopher Stevens.
Chip Somodevilla/Getty Images
Obama Attends Presidential Inaugural Prayer Service