Prince of Wales and the Duke of Cornwall have become the first members of the royal family to visit Cuba.
Prince Charles and Camille's trip is expected to launch a new chapter in the United Kingdom's relations with the communist state.
The couple attended the ceremony to lay the crown to the national hero Cuba, essayist and poet Jose Marti.
They will join the President of the country for an official dinner.
Later this week, they will be joined by Commonwealth Minister Lord Ahmad, who will fly to the country and represent the United Kingdom Government.
Ahmad's presence is an indicator of the importance of Downing Street, which deals with the four-day Cuban visit and its potential for developing new routes with a country that has already begun the process of opening up economically and socially.
After the couple landed on Cuban soil on Sunday from the United Kingdom's RAF Voyager, the Cuban officials were recently taken to a ceremony to lay wreaths.
Prince Charles, in a silent reflection, stood a large rosary of roses that was laid out at a monument in the open air at the Revolution Square in Havana.
The royal couple arrived from Barbados, one of the five Commonwealth Councils that they visited.
St Kitts and Nevis, Grenada, St Lucia and St Vincent and the Grenadines also featured on their tour.
Castro's brothers, the first Fidel and then Raul, ruled Cuba between 1959 and 2018, before Mr. Castro handed over the presidency to Miguel Diaz-Canel.
In recent years, private companies have been encouraged, even though they have been reduced by fears that reforms will promote inequality.
Charles's visit offers an opportunity for the British and Cuban governments to establish closer ties.
There are no plans for the royal couple to meet Raul Castro, but they will be honored guests at an official dinner hosted by Mr Diaz-Canel.
The Prince and his wife will meet with members of Buena Vista's social club in a recording studio in Havana.
The band became famous all over the world, when their 1997 album became a surprising global hit and winner of the Grammy Award.