The Zollern II/IV Coal Mine was considered a 'model mine' when operation began in 1902. It boasted state-of-the-art technology and fantastic architecture, including an art nouveau machine hall and a castlelike administration building adorned with gables and onion-domed towers. An innovative exhibit documents the harsh realities of life as a miner, with plenty of interactive and children-oriented programs. It's one of eight industrial museums across the region linked under the banner LWL Industrial Museum.