Tony enjoys a 10,000km journey along the Trans-Siberian Railway, a network of railways connecting Moscow with the Russian Far East. In Khabarovsk, Tony is met by the extraordinary sight of the River Amur, frozen solid. He's invited to warm up over dinner with a group of locals who offer him a taste of their home-brewed vodka. Tony then re-joins the rails, learning about how Russia has changed since the days of communism. Further stops on his tour are Yekaterinburg, in the foothills of the Ural Mountains and Red Square in Moscow, before he heads west towards Finland's capital city, Helsinki.

• Tony Robinson