![Diversity | Free Full-Text | Postojna-Planina Cave System in Slovenia, a Hotspot of Subterranean Biodiversity and a Cradle of Speleobiology Diversity | Free Full-Text | Postojna-Planina Cave System in Slovenia, a Hotspot of Subterranean Biodiversity and a Cradle of Speleobiology](https://www.mdpi.com/diversity/diversity-13-00271/article_deploy/html/images/diversity-13-00271-g002.png)
Diversity | Free Full-Text | Postojna-Planina Cave System in Slovenia, a Hotspot of Subterranean Biodiversity and a Cradle of Speleobiology
![Postojna, Slovenia. 13th, July 2019. The Postojna Cave is a 24,340 m long cave system near Postojna in southwestern Slovenia. It is the second-longest cave system in the country and one of Postojna, Slovenia. 13th, July 2019. The Postojna Cave is a 24,340 m long cave system near Postojna in southwestern Slovenia. It is the second-longest cave system in the country and one of](https://c8.alamy.com/comp/2CA89JY/postojna-slovenia-13th-july-2019-the-postojna-cave-is-a-24340-m-long-cave-system-near-postojna-in-southwestern-slovenia-it-is-the-second-longest-cave-system-in-the-country-and-one-of-the-countries-top-tourism-sites-photo-credit-gonzales-photo-bo-kallberg-2CA89JY.jpg)
Postojna, Slovenia. 13th, July 2019. The Postojna Cave is a 24,340 m long cave system near Postojna in southwestern Slovenia. It is the second-longest cave system in the country and one of
![Premium Photo | Underground tourist train in postojna cave slovenia it is the secondlongest cave system in the country Premium Photo | Underground tourist train in postojna cave slovenia it is the secondlongest cave system in the country](https://img.freepik.com/premium-photo/underground-tourist-train-postojna-cave-slovenia-it-is-secondlongest-cave-system-country_527096-20083.jpg)
Premium Photo | Underground tourist train in postojna cave slovenia it is the secondlongest cave system in the country
![Diversity | Free Full-Text | Postojna-Planina Cave System in Slovenia, a Hotspot of Subterranean Biodiversity and a Cradle of Speleobiology Diversity | Free Full-Text | Postojna-Planina Cave System in Slovenia, a Hotspot of Subterranean Biodiversity and a Cradle of Speleobiology](https://www.mdpi.com/diversity/diversity-13-00271/article_deploy/html/images/diversity-13-00271-g001.png)
Diversity | Free Full-Text | Postojna-Planina Cave System in Slovenia, a Hotspot of Subterranean Biodiversity and a Cradle of Speleobiology
![Foto Stock Underground tourist train in Postojna cave, Slovenia. It is the second-longest cave system in the country. | Adobe Stock Foto Stock Underground tourist train in Postojna cave, Slovenia. It is the second-longest cave system in the country. | Adobe Stock](https://as2.ftcdn.net/v2/jpg/04/24/10/45/1000_F_424104519_M8k3pye3b2KTwoQklI1knGyFqSm3Tyqg.jpg)