We are in the Panathenaic Stadium, also known as Kallimarmaro, one of the main historical attractions of Athens as it is the only stadium in the world that was built entirely of marble.
The film opens with two families and the filmmaker focusing on a little boy who holds and flies a paper plane. The little kid continues to play with the paper plane as the camera shows for a while a woman from the group with another little boy, trying to show to a baby how to walk.
The film closes with the families and the boy from the first shot who continues to play with his paper plane as the Panathenaic Stadium is visible in the background.