Medieval design could be eco-house of the future

Engineers and architects at Cambridge University have constructed a prototype "eco-house" based on a 600-year-old design. The plan uses a domed technique developed in Spain called "timbrel vaulting" which retains the sun's heat and cools naturally in the summer. (photo)

The zero-carbon house uses environmentally friendly materials and relies on landscaping to help it blend in with its surroundings. The home has four bedrooms and reportedly cost UKĀ£445,000 to construct.