The system of interlocking corridors beneath the entire medieval town has a truly European dimension, with a total length of 30 km. The corridors, running several floors above, were sculpted in the rock from the 13th to the 17th centuries and were well supplied with water from the so-called Jesuit water main. They served as food stores, but also as shelters of the inhabitants at times of danger to the city and formerly connected with the castle. The sightseeing tour starts at the Hen Market and is 1 km long.

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