Queen Elizabeth was buried with her husband, Prince Philip.
Britain's Queen Elizabeth II "died peacefully" on Thursday, Sept. 8, at Balmoral Castle, the British royal family's estate in Aberdeenshire, Scotland, according to a statement from Buckingham Palace. She was 96.
Elizabeth was Britain's longest-reigning monarch. She ascended to the throne in 1952 and, in June, celebrated her Platinum Jubilee, marking 70 years as queen.
President Joe Biden and first lady Jill Biden departed from the White House on Saturday and are headed to London to attend Queen Elizabeth II's funeral on Monday.
King Charles III and Prince William made a surprise visit to Westminster Hall, meeting with mourners who stood in line to view the queen's coffin.
Mourners took photographs of Charles and William, pressing up against metal barriers to speak to them and shake hands.
The newly-crowned monarch will undertake several audiences at Buckingham Palace today.
At 5:45 a.m. ET, the King received the First Sea Lord, Chief of the Air Staff, Chief of the General Staff, Chief of the Defence Staff, Vice Chief of Defence Staff and the Commander of United Kingdom Strategic Command. They met in the 1844 Room of Buckingham Palace.
Then at 8 a.m. ET, King Charles III will meet with the Governors General of the Realms for a reception and lunch.
Following the meal, the King is scheduled to receive the Prime Ministers of the Realms at 10:45 a.m., which will also take place in the 1844 Room.
Peter Stratford, one of the firefighters who battled the blaze at Windsor Castle in 1992, joined the queue to pay his respects to Queen Elizabeth II.
Stratford, from Surrey, said he met the queen five years later when he was invited to a reception at Windsor Castle to celebrate its restoration.
"She was so lovely," Stratford told ABC News on Friday as he waited in line.
"I'm 70 years of age," he said. "Seventy years she's been my queen. It's very touching."
-ABC News' Faith Abubey
