One of them is this:
Postojna Cave-Underground Post Office (issued 06-04-2013)
(It is a joint issue with Slovenia)
The Postojna Cave (Slovenian: Postojnska jama; German: Adelsberger Grotte) is located near the city of Postojna in Slovenia and is the second-largest for visitors developed stalactite cave in the world. Between 1900 and 1914 the Royal and Imperial Post had a post office only for the cave
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