Great tour. In 2 hours you see the first stations built on line 1. It goes beyond the superficial architecture to explain the meaning and reasoning behind it and provide a very interesting picture of 20th century Russian history and culture, including the Revolution, the Siege of Leningrad, Soviet values, industrialization and others. Vladimir explains all this in detail, covering things that would be easily missed otherwise. You also see a couple of construction details affected by the Cold War. Fascinating.