Netherlands-based firm Open Platform for Architecture (OPA) is breaking conventions by building into the earth, rather than above it.
원문출처 : http://www.cnn.com/2016/12/27/architecture/opa-underground-architecture-series/index.html
원문출처 : http://www.cnn.com/2016/12/27/architecture/opa-underground-architecture-series/index.html