The $2 billion Bahnstadt campus in Heidelberg, south-west Germany, is a cutting-edge eco community with buildings that don't require heating or air conditioning.
원문출처 : http://www.cnn.com/2016/11/01/architecture/heidelberg-green-village/index.html
원문출처 : http://www.cnn.com/2016/11/01/architecture/heidelberg-green-village/index.html