As a matter of fact, I have.
It was built in the early days of the USSR. Its breathtakingly beautiful. Kinda hard to ignore the ghastly structures that surround it. Same thing.
No, I'm not sure it is the same thing. While I agree that the Moscow Subway is beautiful, I recall reading that tens of thousands of political prisoners died building it. I remember no such statistics from the early-days of the Social Security Administration. Perhaps you could refresh my memory?
Americans were too smart. We put an end to things before they got out of hand (if you ignore the Japanese concentration camps).
Pity about the opportunity cost. We should be colonizing Mars by now.
My point was that not everything Socialist fails. Especially in the early days.