The famouse 'St. Pietersberg' caves, located near Chambres d'hotes / Café La Cloche, are the result of centuries of excavation of marl, a building stone. What we now see is an enormous labyrinth of more than 20,000 passages. The stone-hewers have left their marks. On the walls are interesting inscriptions, some extremely old; artists too, have been at work here. During the many sieges Maastricht has suffered, and also during the last world war, local inhabitants used the passages as a shelter; some of the emergency provisions are still to be seen.
The temperature in the caves is 9-10 degrees Celcius; visitors are therefore advised to take a cardigan, pullover or coat with them. The round-trips, which last about an hour, are led by official VVV Tourist Office guides. Two sections of the labyrinths of Mount St. Pieter are open to the public.
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