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Postojna Cave has been known – and visited – by residents of the area for centuries; you need only look at the graffiti dating back seven centuries in the Gallery of Old Signatures by the entrance. But people in the Middle Ages knew only the entrances; the inner parts were not explored until April 1818, just days before the arrival of Habsburg Emperor Franz I (r 1792–1835). The following year the Cave Commission accepted its first organised tour group, including Archduke Ferdinand, and Postojna’s future as a tourist destination was sealed. Since then more than 30 million people have visited Postojna.