The deposit of rock salt in Wieliczka and Bochnia has been mined since 13th Century CE. This major industrial undertaking has royal status and is the oldest of its type in Europe.
The Aztec Sun Stone - also known as the Aztec Calendar Stone - is an enormous circular stone carved from basalt, covered with hieroglyphic carvings, weighing 25 tons, 3.60 meters in diameter and 98 cm thick. Carved by the Aztecs between 1500 and 1521 AD.