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</html><thumbnail_url>https://postojnsko.si/travel/wp-content/uploads/2023/05/postojna-cave-visit-postojna-photo-iztok-medja-7-scaled.jpg</thumbnail_url><thumbnail_width>2560</thumbnail_width><thumbnail_height>1708</thumbnail_height><description>Postojna Cave was discovered long ago, in 1818 by a local, cave guide Luka &#x10C;e&#x10D;. Today, Postojna Cave is the most visited European cave and at the same time the most visited tourist sight in Slovenia. To date, it has been viewed by more than 40 million enthusiastic visitors from all over the world. With...</description></oembed>
