"Man and the Moon" is an episode of Disneyland, which originally aired on December 28, 1955.
This segment features characteristics of the Moon depicted from William Shakespeare and children's nursery rhymes to lunar superstitions and scientific research.
Kimball then introduces Dr. Wernher von Braun, who discusses plans for a trip around the Moon.
Towards the end, this film presents what seems to be a bit of "sci-fi"; as the RM-1, crossing the Moon's night side, approaches the night/day terminator, high radiation is suddenly detected, and a flare fired over the area reveals what looks like a rectangular double wall, or the ruins thereof, extending out from a crater; strangely, none of the crew remark on it, and the unusual radiation is never mentioned again.
[1] The episode was released on May 18, 2004, on Walt Disney Treasures: Tomorrow Land.