The Caves of Maastricht, also known as the caves of Mount Saint Peter or the Maastricht Underground, are a collection of limestone quarries in Maastricht, the Netherlands, the origins of which date back to the 13th century. They were originally dug to mine chalk.
The Caves of Maastricht, also known as the caves of Mount Saint Peter or the Maastricht Underground, are a collection of limestone quarries in Maastricht, the Netherlands, the origins of which date back to the 13th century. They were originally dug to mine chalk.
Source: Wikipedia "Caves of Maastricht" · CC BY-SA 4.0
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