Photo: Kj · CC BY-SA 4.0 · via Wikimedia Commons
Catacombs & Underground · Poland
Bochnia Salt Mine
The open question
Built, used, sealed and forgotten. Why does that keep happening with what's under our cities?
On the record
The Bochnia Salt Mine in Bochnia, Poland, is one of the oldest salt mines in the world and is the oldest commercial company in Poland. The Bochnia salt mine was established in 1248 after salt had been discovered there in the 12th and 13th centuries and became part of the royal mining company, Żupy krakowskie. As a result of this, over the next decades, the August Passage was able to reach a length of nearly 3 km (2 mi).
- Year
- 1248
- Kind
- tunnels

