The Bochnia Salt Mine 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, as designated October 6, 2000, and tracked by the National Heritage Board of Poland.
The mine shafts measure 4.5 kilometres in length at about 330–468 metres in depth below the surface, at 16 different levels. 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 situated at a depth of 176m - from the top of the Sutoris shaft and the depth of 212m counting from the top of the Campi shaft. The August Passage was initially called the Long Stove. 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 now open to sightseers. The largest of the preserved chambers has been converted into a sanatorium.
The Ważyn Chamber was named after the name of the administrator Andrzej Ważyński. The deepness of this chamber, the biggest in Bochnia Salt Mine, is 248m, its length - 255m, its maximum width 14,4m and maximum height 7,2m. The chamber uses no supporting pillars. Salt from Ważyn chamber was extracted from 1697 until the 1950s.
In 2013 the mine was added to the UNESCO World Heritage List as an extension of the Wieliczka Salt Mine inscription of 1978.References:
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne"s court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.