The tripto catalogue lists 127 industrial and technical heritage sites: mines, canals and locks, factories, lighthouses, halls and radio stations. It is one of the best categories for a rainy day and for a trip with kids.
The Wieliczka Salt Mine (UNESCO) takes you along a 3.5-kilometre route down to 135 metres, past St Kinga's Chapel carved in salt and underground lakes. The nearby Bochnia Salt Mine, the oldest in Poland, has a mine train, a boat crossing and a 140-metre slide. Centennial Hall in Wrocław, built in 1913, had a record-breaking reinforced-concrete dome at the time; the Pergola and fountain next to it are free. On the Elbląg Canal, boats cross five slipways by riding on rails over land – powered by water alone. In Zabrze, the Guido Mine lowers visitors 320 metres underground in a cage, and in Łódź the White Factory of Ludwik Geyer shows textile machines in operation.
Most industrial sites are in the Silesian region (more than 25) and Lower Silesia (about 20), followed by Greater Poland, Pomerania and Warmia-Masuria (about 10 each). Silesia is the heartland of mines and former industrial works.
In practice: allow two to three and a half hours per site. Mine tickets are above average – the Polish-language route in Wieliczka costs 103 zł off-season and 125 zł in summer – but many sites offer cheaper family tickets or a free day: the Gliwice Radio Station on Saturdays, the White Factory on Wednesdays. It is cool underground all year, so bring a jumper.