The headquarters of the Catalan museum of Science and Technology (mNACTEC) is in the city of Terrassa, in a former woollen mill in modernist style - the Vapor Aymerich, Amat i Jover - it was built between 1907 and 1908 by the architect Lluís Muncunill. Currently, the mNACTEC offers exceptional contents in the permanent exhibitions : Lluís Muncunill, architecture for industry, Homo Faber, The Woollen Mill, Enérgeia, Transport, The Carillon, The Photovoltaic Wall and renewable energy : The mNACTEC system articulate a Territorial museums of science and technique that comprises 20 museums (mining, textile printing, model villages...) so that people understand the industrialisation in Catalonia. The Llobregat river has the greatest concentration of factories and textile industry colonies in Europe, constructed in the late nineteenth and early twentieth centuries. The introduction of industry in the Llobregat river zone was closely related to mining activities (resources included calcareous rock, oil, coal, salt and clays) as well as to the exploitation of the river itself with hydroelectric power generation by the turbines of the factories and industrial colonies.