Deep underground cities and salt palaces
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Masterpieces of water engineering
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Forgotten stone fortresses and lost walls
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Sunken cities and floating stone ruins
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Master of Secret wonders of the world
schopenhauer A massive network of ancient tunnels in northern France became a safe haven during medieval wars and World War I.
schopenhauer Polish miners carved an entire cathedral and intricate chandeliers out of dark grey rock salt over hundreds of years.
schopenhauer Drag hidden salt landmarks to their locations to discover how they shaped ancient history.
Salt chandeliers: The chandeliers in the Wieliczka Salt Mine are made of salt crystals that were dissolved and reconstituted to make them perfectly clear.
A naturally occurring crystalline form of sodium chloride, commonly known as rock salt. Polish miners carved the subterranean Chapel of Saint Kinga entirely from this mineral.
How deep below the surface is the Salt Cathedral of Zipaquira in Colombia located?
During which major 20th-century conflict did soldiers leave thousands of graffiti tags in the tunnels of Naours, France?
What accidental discovery in 1963 revealed the 18-story underground city of Derinkuyu in Turkey?
What natural material was used to carve the chandeliers in the Wieliczka Salt Mine?
Which indigenous group originally mined the salt deposits at Zipaquira, Colombia, before the cathedral was built?
What feature did the residents of Derinkuyu use to block invaders from entering their underground chambers?
For how many centuries has the Wieliczka Salt Mine in Poland been in operation?