Ten kilometers southeast of Krakow lies a unique underground salt city in the world, the "Willichika Salt Mine. It is also one of the first UNESCO World Heritage Sites to receive income. There are churches and chapels under 327 metres of ground. There are also intricate ventilation, drainage, lighting and transportation systems. The Willichika Salt Mine began to be mined in the 13th century. At that time, salt was indispensable in life and produced little, so its commercial status was very important. At present, there is almost no mining because of lack of funds. Salt mines must be brought in by tour guides. First, you will go down the wooden stairs to the ground 50 stories. By this time, you will be dizzy. The largest one in the salt mine is St. Ginka's Church, which was built in the 17th century. The church floor, sculptures, reliefs and giant crystal lights are all made of salt. There are also "Last Supper" reliefs and visual 3D effects. Underground stores have unique salts for sale, food, paint and exfoliation.