President Obama signed a series of executive orders about the administration's new gun law proposals and was joined by children who wrote letters to the White House about gun violence.
Hindu priests performed during an aarti ceremony on the banks of the Ganges River during the Maha Kumbh Mela in Allahabad, India.
New Yorkers participated in the no-pants subway ride.
A woman snapped a pic of a manta ray at Resort World Sentosa's Marine Life Park in Singapore, the world's largest oceanarium.
Residents dressed in traditional kimonos and posed for a picture during the Coming of Age Day at Cultural Hall in Himeji, Japan.
Princess Eugenie and Princess Beatrice of York visited the British School in Berlin in Germany.
US Air Force Staff Sgt. Serpico Elliott and Army specialist Delandra Rollins stood in for US President Barack Obama and Michelle Obama during an inauguration rehearsal on Capitol Hill.