The square-shaped market square with eight streets going out of it, two from each corner, dates from the reign of King Casimir the Great. The pavement of the Upper Market Square is currently covered with a work of Ryszard Paprocki, entitled “Salt World”. It is the largest 3D painting in Poland and probably the second largest in the world. The “Salt World” painting is an artistic vision of the salt mine’s underground. The author adapted to the composition of the painting the existing bronze sculptures of four miners who come out of the underground to the wooden platforms.