Back visiting my wife's folks again. One of you suggested visiting the iron works in Völklingen. Great shout. A world heritage site and very interesting. Great views from the top of the biggest blast furnace (50 meters up). Worth the 15€ ( under18 free).This year a Buddha photo art exhibition to see as well. My phone camera don't do the place justice . The last one is taken in the blower room. Gas from the coked coal powers this massive engine which drives an interesting air pump that combines an oil mist to make the 'blast' for the furnaces. There are good models and display areas a-la science museum, great for children. Your free to roam around as well, it's a big site!