President Barack Obama walks with Salvador Valdez Mesa (L), Vice President of the Council of Ministry, as they take part in a wreath laying ceremony at the Jose Marti memorial in Revolution Square on March 21, 2016 in Havana, Cuba. Mr. Obama’s visit is the first in nearly 90 years for a sitting president, the last one being Calvin Coolidge.

(March 20, 2016 – Source: Joe Raedle/Getty Images South America)