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St.-Pietersberg : Michelin's recommendations
This hill lying between the Meuse Valley and the Geer Valley is known for its caves, the product of quarrying excavations since Roman times; the extracted marl stone was used for building works in Maastricht. Today, a network of galleries running for 200km survives, 12m high in places and decorated with charcoal drawings. The sedimentary rock offers up many fossils. Traces of habitation in the caves.