Wieliczka salt mine
Under Wieliczka lies a layer of salt, almost 400 meters thick, measuring 10 kilometers by 500 to 1300 meters. 5500 years ago the first salt was extracted already. Until the middle ages by vaporisation of the salty water, later by mining the salt.
When you don't see the puzzle, please check whether your device can handle html5 or java. Read here why the puzzles look different and which problems there can be
When you don't see the puzzle, please check whether your device can handle html5 or java. Read here why the puzzles look different and which problems there can be