Beneath the Vegetable Market winds a secret system of underground tunnels, the remains of cellars beneath houses built in the Middle Ages. The tunnels served both as a shelter for the townspeople in times of danger to the city and to preserve food (in place of nonexistent refrigerators) and for the maturation of beer and wine. The cellars were not interconnected in the past; this occurred in 2009 when completing their reconstruction. This created a unique complex accessible as part of a tour route leading 6-8 meters below the surface of the square.
The entrance to the labyrinth is located on the Green Market at No. 21.
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