Viva la Revolucion en el Parque Meridian Hill!
That was the scene (maybe) in 1959 at Meridian Hill Park, when a 32-year old Fidel Castro paid a visit to DC. He was staying at the Cuban Embassy at 2630 16th Street NW, which is now the Swiss Embassy's Cuban Interests Section. Since the US doesn't have diplomatic relations with Cuba, the building is technically Swiss territory.
Castro was in town just a few months after the Cuban Revolution overthrew Fulgencio Bastista to meet with American diplomats and more. Ghosts of DC has a great post on the visit with photos via Old Time DC (a great Facebook group.) Above is the man himself holding a kid in from Columbia Heights in Meridian Hill Park, and below is a report from the Washington Post and Times Herald that Ghosts of DC dug up. Interesting stuff.