[Answer] Where is this royal salt mine?

Step 1 : Introduction to the question "Where is this royal salt mine?"

...1. Bulgaria 2. Hungary 3. Poland 4. Czechia

Step 2 : Answer to the question "Where is this royal salt mine?"

Poland - Salt was one of the first and most significant industries in Europe. Polish kings saw the value of the trade and created a Middle-Aged monopoly over what they called “white gold," producing mines, as well as brewing and storage facilities. The Royal Salt Mines were born. The Polish mines at Wieliczka and Bochnia have been around since the 13th century. The result is an evolution of 2,350 underground chambers stretching across nearly 149 miles at a depth of up to 1,073 feet. Production ceased in the Royal Salt Mines in the 20th century, but they did not fall into disuse. As a UNESCO World Heritage Site, the subterranean kingdom of salt transports visitors into the past, fitted still with historic tools and machines, as well as chapels, artwork, and sculptures made of salt.:

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