Here you see the blast furnaces at Völklingen Ironworks, Völklinger Hütte (Germany), a  - UNESCO World Heritage site.  The plant closed in 1986.   Today, the Völklinger Hütte is a museum.  You can tour the production areas, or visit the  interactive science center which has ironmaking exhibits.   

Völklingen Ironworks  Credit and many thanks to: flickr.com member mbell1975, shown here
with permission.  This photo and others from the Völklingen photostream 
by mbell1975 are posted at this flickr.com site.