The royal visitors had tea in the Green Room and were brought into the garden to see a newly-expanded beehive, rebuilt in the shape of a miniature White House.
This honey-coated piece of diplomacy was intended to appeal to King Charles, who is an enthusiastic supporter of bee-keeping.
The state visit, carried out on behalf of the UK government, is a soft power attempt to strengthen relations, in a year in which the US is marking its 250th anniversary of independence.
Queen Camilla was wearing a brooch which combines the British and US flags, which was given to the late Queen Elizabeth II by the mayor of New York on a state visit in 1957.
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