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The Kleinenbremen Visitor Mine is a mine located in the Kleinenbremen district of the East Westphalian town of Porta Westfalica. It opened in May 1988 and is located in part of the disused Wohlverwahrt mine in the Weser Mountains. Iron ore was mined from the mine by Barbara Erzbergbau until the 1960s.

The Kleinenbremen Visitor Mine in Porta Westfalica is a fascinating destination for cyclists interested in industrial culture and geological history. In the former "Wohlverwahrt" iron ore mine, which was in operation from 1883 to 1957, visitors can now immerse themselves in the world of mining. The approximately 90-minute tours lead through underground tunnels, past original machinery, and end at the impressive "Blue Lagoon" – a subterranean lake formed by groundwater. A special experience is the ride on the mine train, which transports visitors to the various stations in the mine. The tours are led by experienced miners who provide authentic insights into everyday working life underground. In the adjoining Museum of Mining and Geological History, exhibits such as fossils, tools, and historical documents can be viewed. There are special programs for children, where they can, for example, try out a drill hammer or simulate a blasting operation.    

Tunnel of the Barbara Erzbergbau GmbH at Nammer Berg with strong escaping air flow.

Here is an old mine with a museum

In 2006, the Wohlverwahrt iron ore pit was recognized as a national geotope and has thus been included in the list of the most important geotopes in Germany. Source: Wikipedia

Wonderful place to rest and explore!

RINTELN: If you are looking for the "coolest place" in town, you will find it at the extreme tip of Rinteln behind Todenmann in the "Papenbrink" quarry. A constant 10 to 12 degrees Celsius comes from the mining tunnel, so you almost need a jacket even when the outside temperature is 30 degrees. The quarry can be reached on foot via the hiking car park in the hairpin bends from Todenmann to Kleinenbremen. Source: https://www.schaumburger-wochenblatt.de/artikel/2020-08-19-der-kuehlste-platz-der-stadt

Not every path that is marked actually leads to this cave. But there are ways to do this that Komoot doesn't seem to know yet.