this was a number of years ago, but I don’t remember if it was tv or movie. All I remember is a scene in a Parthenon or gazebo type building in technicolor clouds. Definitely pre 2000s show, possibly as early as the 50s or 60s. There were a bunch of teenagers there dressed in Greek style togas, and two of them were in love. The girl had to go on a boat and be born though, so they were forced to tearfully separate, with both wondering how, but promising they would meet again in the “real world” and would still love each other, no matter their ages.