What do you do when you arrive in Krakow on a rainy, cold morning and your hotel room is not ready? You go to the Wieliczka Salt Mine, of course. It's actually pretty interesting. The mine is a UNESCO World Heritage Site, mining started here in the 13th century but salt collection at the site dates back to prehistoric times. Salt is still collected from the water that is constantly pumped from the mine. The mine has countless statues carved from salt by the miners and lots of chapels, rooms, etc carved right out of the rock and salt. It reaches a depth of 327 metres (1,073 ft) and is over 300 kilometres (190 mi) long.