Wieliczka Salt Mine (UNESCO/NHK)

Description
This deposit of rock salt in Wieliczka-Bochnia has been mined since the 13th century. Spread over nine levels, it has 300 km of galleries with works of art, altars, and statues sculpted in the salt, making a fascinating pilgrimage into the past of a major industrial undertaking. Source: UNESCO TV / © NHK Nippon Hoso Kyokai URL: https://whc.unesco.org/en/list/32/