Secrets of the Castle, or Secrets of the Castle with Ruth, Peter and Tom is a British factual television series that first broadcast on BBC Two from 18 November to 17 December 2014. The series stars archaeologists Peter Ginn and Tom Pinfold, and historian Ruth Goodman. In the series, the team takes part in the medieval construction project at Guédelon Castle in Treigny, France. During their stay there, they reveal what kind of skills and crafts were needed to build a castle in the 13th century, by using the techniques, tools and materials of the era.