What is Russia's 'Golden Ring'?

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Russia's 'Golden Ring' - a ring of ancient towns and cities around the Russian capital of Moscow - has become one of the most popular routes to take in Russia. Local tour guide Sergei Sedov walks us through the city of Vladimir and explains why the ring is so significant. (Photo: Russian tour guide Sergei Sedov in the city of Vladimir. Credit: Mike Innes/BBC)