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.

[1] 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[2] 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.

The castle construction site shown in the series is Guédelon Castle in France, a 25-year experimental archaeology project where a castle is being built using only the techniques, tools and materials from the Middle Ages, ie.