聖彼得山裡全是石灰岩，從羅馬時代起，人們就從這裡挖掘石灰岩塊來建造馬斯垂克城裡的教堂、建築物和城牆等。它的石灰質純淨，也可作淨化水之用。由於長期挖掘岩塊，地下就形成了許多洞窟及通道。曾經這裡近兩萬條通道，後來有一大半因為水泥業的發展而被毀了。二戰時，曾是秘密的藏身之地。
Mount St. Pieter is a hill plateau with limestone massif. Since Roman times, people started to use the limestone blocks of Mount St. Pieter for the constructions in Maastricht, such as churches, buildings, walls etc. Therefore, there are many caves and underground corridors in this area. Here used to have almost 20.000 corridors but half of them were destroyed due to the developement of the cement industry. During the 2nd War World, this underground area used to be a secret hiding place.
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