Building a 13th Century Castle with 13th Century Tools - Very Slowly!

If you really want to understand how something was done, do it yourself. Archaeologists and builders throughout the years have tried that technique as a way to understand how ancient civilizations were able to construct megaliths like Stonehenge and wonders like the pyramids. Now, a group of master builders in France is trying their hand at constructing a castle using only 13th century tools.