This has got to be one of my very favorite Twilight Zone episodes, primarily for the portrayal of two lonely souls in a post-apocalyptic environment.
The cobweb-strewn shops and rubble-laden streets are eerie in that particular way the Twilight Zone does best.
While the parable can be a bit heavy-handed by today's drama standards, it is an excellent one - using the setting to make a statement relevant to the human experience, as well as geopolitics, in a way that is timeless. The entire drama rests solely on the shoulders of Mr. Bronson and Ms. Montgomery, who do not disappoint. (May they both rest in peace.)
A true classic.