Hidden place · Maastricht, Netherlands
Saint Pietersberg Caves
These local marlstone mines contain more than 20,000 passages dug over many centuries. The tunnels were also used as shelter during sieges and bombings, and…
Hidden place · Maastricht, Netherlands
These local marlstone mines contain more than 20,000 passages dug over many centuries. The tunnels were also used as shelter during sieges and bombings, and…
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