Greenhouse in Matadero cultural center in Madrid Rio. Matadero Madrid is a former slaughterhouse in the Arganzuela district, which has been converted to arts centre and greenhouse. Capital Cities, Matadero, River, architecture, arganzuela, building, capital, city, cityscape, creativity, cultural, culture, destination, europe, european, greenhouse, industrial, interior, landmark, madrid, madrid rio, manzanares, plants, promenade, regeneration, rio, slaughterhouse, spain, spanish, travel, urban