Khám phá chiếc cầu cạn hình xoắn ốc độc đáo
Cầu cạn Brusio ở Thụy Sĩ là một trong những công trình cầu độc đáo được thiết kế dành cho xe lửa tọa lạc tại một địa điểm núi non hữu tình.
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