Abandoned coal mine

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One of the entrances to the mine

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"Sretno" translates to "Glück Auf"

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The way splits...

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Endless tunnels

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A clearly visible coal vein

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The mines in this region of Croatia were mostly used between 1928 and 1966. There were about 30 floors and almost 400 kilometors of tunnels. When exploring, it is very easy to get lost, so draw yourself a map or remember the way out.^[1]

^[1]: According to: Own knowledge and https://pepperurbex.com/rasa-coal-mine-1928-1966-hr/