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The Bochnia Salt Mine (Polish: ''kopalnia soli w Bochni'') in Bochnia, Poland is one of the oldest salt mines in the world and the oldest one in Poland.〔 The mine was established between the 12th and 13th centuries after salt was first discovered in Bochnia and became part of the Royal mining company żupy krakowskie (Kraków salt works). The mine was closed some time after World War I. In 1981 it was declared a heritage monument. The site is one of Poland's official national Historic Monuments (''Pomnik historii''), as designated October 6, 2000 and tracked by the National Heritage Board of Poland. == History == The mine shafts measure in length at about 330–468 metres in depth below the surface, at 16 levels. In 2013 the mine was added to the UNESCO World Heritage List as an extension of the Wieliczka Salt Mine inscription of 1978.〔(Wieliczka and Bochnia Royal Salt Mines (extension to the Wieliczka Salt Mine). ) ''UNESCO World Heritage Centre'', 03/07/2013.〕 ===August Passage=== The August Passage is the main communication and transportation route in the mine. It runs from the east to the west of mine, connecting in a straight line the bottom ends of the Campi and Sutoris shafts. It is at a depth of 176m from the top of the Sutoris shaft and 212m counting from the top of the Campi shaft. The August Passage was initially called the Long Stove (Piec Długi). Its first part, extending between the Rabsztyn Chute and a Campi Shaft, was built in the years 1723-1743, in accordance with a design by Jan Gottfried borlach. His great achievements was to regulate routes in the mine by ensuring their straightening and leveling. As a result of this, over the next decades, the August Passage was able to reach a length of nearly 3 km. Excavated chambers, shafts and passages form an underground town, which is open to sightseers. The largest of the preserved chambers has been converted into a sanatorium. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bochnia Salt Mine」の詳細全文を読む スポンサード リンク
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