The U.K. and much of the world are mourning Queen Elizabeth II, who was celebrated at a funeral at Westminster Abbey Monday and will later be laid to rest beneath St George’s Chapel with her husband of 73 years, her sister Margaret and her parents.

The queen’s casket entered Westminster Abbey around 11 a.m. local time Monday, exiting around noon after the funeral proceedings.

Following the state funeral, the royal family escorted the queen’s casket to Wellington Arch, with cheers from onlookers accompanying the procession. After the passage through central London, the coffin was placed in a hearse and headed for Windsor Castle for a committal service.

The state funeral, expected to be the biggest gathering of world leaders in years, drew in millions of people to the streets of London and likely billions more to their TVs and computer screens.

The funeral and events surrounding it were designed to help unite the royal family and divided subjects while helping ensure the monarchy survives another century.

Two million people lined the streets as members of the royal family and hundreds of foreign dignitaries and heads of state descend on Westminster Abbey.

More than 10,000 police officers were on patrol in London with reinforcements supplied from all of Britain’s 43 police forces, authorities said.