President-elect Donald Trump’s inauguration on January 20 will mark the 60th presidential swearing-in ceremony in United States history.

Which president had the longest inaugural address? Which has been sworn in the most? Which ended the ceremony’s top-hat tradition? Here are some tidbits you might not know about Inauguration Day.

Former President George W. Bush’s now-viral facial expressions during Donald Trump’s second inauguration have left the internet humored. On Monday, the 43rd president attended Trump’s inauguration alongside his wife,

The 'Today' co-host addressed her father, George W. Bush's silly facial expressions from President Trump's inauguration ceremony.

As millions watched President Donald Trump’s inauguration at the White House on Monday, Jan. 20, many noticed that he did not place his left hand on a Bible while being sworn in. Now people are questioning that gesture, and wondering if the president can be sworn in without using a Bible.

The tradition of swearing the oath of office on a Bible stretches back to George Washington, but not all presidents have observed it.

It’s traditional to use a Bible during the presidential oath of office, but it is not required. Only the oath is mandated by the Constitution.