Austria - Slovenia JOINT Issue 

" CAVE PA ADELSBERGER GROTTE." 

MNH ~ Miniature Sheet ! 

Postojna Cave - German "Adelsberger Grotte" Slovenian "Postojna Cave" - ​​forms the subject of the new community edition of Austria and Slovenia. In the karst area around the Slovenian town of Postojna are the second largest undeveloped for tourists caves in the world. 

The emergence of the three-principal planes cave system accounts for the fact that on the southwestern edge of the Pivka basin of the little permeable to water so-called "Eocene flysch" is bordered on the ground against powerful limestone layers of chalk, which consist of very pure limestone, which in turn much more strongly by water is resolved as the sand-and mudstones of the Flysch. 

Dating of cave sediments deposited gave an age of about 900,000 years. The course of the cave passages shows two main directions, with the majority so clearly runs in a northwest-southeast direction and parallel to tectonic disturbances in the cave area, the other part is approximately perpendicular to it and is much more branched. 

The first cave is anno 1213 busy; First time in 1818 light was installed, roads were laid out and discovered new parts of the cave. Since the completion of the railway Vienna-Ljubljana-Trieste 1857, the number of visitors increased considerably. 

The first cave railway ran from 1872, 1914 locomotives came with a combustion engine for use in 1959, these were replaced by electric railway. 1968 those still existing routes were finally applied can be performed on the yearly more than half a million visitors. 

Somewhat curiously, of course, is the fact that a post office in the Postojna Cave was established in the late 19th century (see motif of the brand blocks). Evidence of the stamp used there have been documented of Pentecost 1900-1914 on postcards. 

In the Post Office Directory of 1901 under No. 874 Adelberg (Postojna) the "Adelsberger Grotte" cited with a footnote: "Letter adoption agency services on Whit Monday, August 15, and another three to four days each year." The Teplitzer newspaper wrote, however, the 09/08/1911: "In this modern grotto, the Austrian Ministry of Commerce has built a Kk grotto post office in view of the highly developed Postcards industry and will there Discontinued mail that arrives from the grotto, even after all cardinal directions, with a private grotto postmark. 

To prove that popularity this institution, may only be for example, states that in this year alone reached 47,000 postcards with a weight of 219 kg to the task at the Grotto Festival in four hours. "- In the course of progression of the war the cave post office was replaced in March 1915 by the imperial post office box 81.

 Year: 2013.