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Watch Horizon Season 3 Episode 8 Online

  • 7.4/10
  • COUNTRIES: United Kingdom
  • Subtitles: English

Europe's heritage of pictures, statues, and buildings is being destroyed at a frightening rate by atmospheric pollution, but an American scientist has just invented a method of preserving limestone. In 1908, a vast explosion shook the Tungus district of Siberia: was it due to the biggest meteorite ever to hit the earth, or something odder?