I came to the real underground city at -135 meters underground.

-135 meters, if calculated according to the standard height of one floor of 2.8 meters, I probably came to the position of nearly 50 floors underground. What shocked me was that there was a small square here, and there might be a real underground city here. The Wieliczka Salt Mine in Krakow, Poland, has been open to tourists for hundreds of years. Chopin and Copernicus have been here. The deepest mining area is more than 300 meters underground, but it is not open to the public. There are rooms, chapels, underground lakes, etc. in the mining area. Some carvings were even born in the Middle Ages. The largest square was built by three miners for a full 67 years. The chapel also has a salt carving mural "The Last Supper". There are two ways to visit the salt mine. One is ordinary sightseeing, which requires a guided tour. The salt mine entrance is grouped according to language. There are English, Spanish, Italian, Russian, etc., but no Chinese. I followed the English team. At the door, about 20 people will be led by the tour guide. To go to the salt mine, you need to walk up the stairs, that is, go down about forty or fifty floors all the way. There is an elevator when you leave, but of course, walking down is also a very wonderful experience. You will gradually feel the temperature getting colder. The other is to make an appointment to participate in the miner experience route. The appointment location and ordinary sightseeing are at the same ticket office. Just explain when buying the ticket. The entrance is in another direction. It takes about 10 minutes to walk out from the ordinary sightseeing entrance. The miner experience route needs to wear standard miner clothes and cannot bring large personal items. Miner route-The Regis Shaft 139 PLN about CNY 250