The caves of S.Peter near Maastricht are the results of centuries of mining for a stone called marl which apparently is used for soil neutralization.
The digging activities have left behind a maze of around 20.000 tunnels, many of them decorated with pictures and drawings from local artists.
Guided tours are available.
http://www.holland.com/us/tourism/Cities-in-Holland/Maastricht-1/Attractions-in-Maastricht-1/caves-of-st-pieter.htm
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