On Sunday was World Heritage Day and I visited the monuments of the Upper Harz Water Management System in Clausthal-Zellerfeld.
Clausthal-Zellerfeld is a town in the Harz Mountains in the German State of Lower Saxony. The town was founded in 1924 when the two mining towns of Clausthal and Zellerfeld were merged. It is especially known for the Clausthal University of Technology. In 1843 Robert Koch was born in Clausthal.
The Upper Harz Mining Museum was opened in 1892. It is one of the oldest technological museums in Germany and shows various exhibits about the mining in the Upper Harz. In 2017 the museum celebrates the 125th anniversary of its opening.
For the World Heritage Day a special post office with a special postmark was erected at the museum. The special postmark shows the Emperor Wilhelm Shaft, which also celebrates its 125th anniversary in 2017.
The Ottiliae Shaft was in use between 1868 and 1930. It has the oldest still-existing headframe in Germany, which was built in 1876. Today it is a satellite branch of the Upper Harz Mining Museum. As part of the Upper Harz Water Management System it is since 2010 on the UNESCO World Heritage List.