US President Joe Biden arrived in London on Monday for the funeral of Queen Elizabeth II.
ALL IMAGES CREDIT: GOOGLE
Mr Biden is one of around 500 heads of state and foreign dignitaries who will descend on London for a gathering of world leaders not seen in decades.
The prime ministers of Canada, Australia and New Zealand are already in the UK.
As well as Canadian Prime Minister Justin Trudeau, Australian Prime Minister Anthony Albanese and New Zealand Prime Minister Jacinda Ardern, other Commonwealth leaders
Bangladesh Prime Minister Sheikh Hasina and Sri Lankan President Ranil Wickremesinghe are also expected to attend. India will be represented by President Draupadi Murmu.
Among the expected world leaders are French President Emmanuel Macron, Ireland's Taoiseach Michel Martin, German President Frank-Walter Steinmeier and Italian President Sergio Mattarella.
Members of royal families from across Europe will also be present.
Many guests are required to pay their respects to the Queen while she remains at Westminster Hall and to sign a condolence book at Lancaster House.
However, the focus will be on the formal state reception, which will be hosted by King Charles III at Buckingham Palace on Sunday.
For many leaders, this is the only chance to meet together and engage in some diplomacy.
However, some of the guests invited to the funeral raised eyebrows.
The extension of an invitation to Saudi Arabia's crown prince and de facto ruler Mohammed Bin Salman (known as MBS) was controversial.