Watch | Now, a handmade castle is taking shape in France

Foregoing modern conveniences, workers are building by hand a large, medieval castle in France. It has been under construction for 19 years - and will need another 10 to 15 years to complete. Using only 13th century building techniques and tools, workers are using stone, clay, wood, fire and a lot of sweat to construct the castle. It has been under construction for 19 years - and will need another 10 to 15 years to complete. Organizers hope recreating ancient techniques will offer lessons for the modern world about sustainable building.