The more than 30 km (18.6 miles) long mine system were used during centuries to extract stone to build the Hungarian capital.
这条总长超过30公里（18.6英里）的矿区在几个世纪中，提供了建造匈牙利首都的矿石。
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I had spent my childhood thus far being carted around the capital cities of Europe, so the Field Museum satisfied my idea of "Museum," but its domed stone facade was nothing exceptional.
To commemorate their achievements and glorify their names, the Kings of Assyria built huge palaces and temples in their capital cities, which they decorated with stone reliefs.