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Review:
The North Caves, also known as the Marl Caves of Maastricht, is a network of underground caves dating back to the 13th century that play an essential role in the history of the city. Originally dug to mine marl, lime-rich mud that contains large amounts of clay and silt, the caves formed a network so vast with more than 20,000 passageways, that it was later used for purposes other than mining. During the Second World War, the 200-mile long cave complex was used to hide valuable paintings and historical artifacts from the Germans, as well as armaments that could be used against the Germans. The caves were also used as a shelter for citizens of the city during heavy bombardments, and today, the caves can be explored on guided tours.
The North Caves, Grotten Noord Maastricht, Luikerweg, Maastricht, Netherlands
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