The Zollverein Coal Mine is a large former industrial site in the city of Essen. It has been inscribed into the UNESCO list of World Heritage Sites and is one of the anchor points of the European Route of Industrial Heritage. Nowadays it is a Art & Design museum with big exhibitions and beautiful architecture e.g. the the Zollverein Kubus. The Red Dot Design Museum is also there.

 

for more infos – check here:
http://www.zollverein.de/#/welterbe

Red Dot Design Museum:
http://en.red-dot.org/371.html

for the NRW ticket – check here
Free trains in NRW