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    The world's oldest vine trained across the front of its house in Lent, Maribor, with the railing protecting its trunk

    Fun facts

    Interesting facts about Slovenia, all with a source

    Facts checked on

    Quick answer

    Facts about Slovenia you can actually check: Maribor has the world's oldest vine, according to Guinness World Records; Predjama is the largest cave castle in the world; visitors have ridden a train into Postojna Cave for more than 140 years; and Slovenian keeps the dual, a grammatical form for two of something. Here are twelve, all with a source.

    Quick facts

    Facts
    12, all sourced
    Guinness records
    Maribor's vine and Predjama
    Commonest names
    Franc, Marija, Novak
    Language
    Has a dual form

    Facts about Slovenia, in short

    Full read: 2 min

    • Maribor has the world's oldest vine, over 400 years old.
    • Predjama is the largest cave castle in the world, according to Guinness.
    • Slovenian keeps the dual form.
    • More than half the country is forest.
    What I would do

    I'd be wary of fact lists without sources, because many repeat superlatives nobody has checked. Here I only use what the government, SURS, UNESCO or the Tourist Board say, and I flag whose claim each one is.

    Twelve facts about Slovenia and their source

    FactSource
    The world's oldest vine, over 400 years old, grows in MariborTourist Board (Guinness record)
    Predjama is the largest cave castle in the worldTourist Board (Guinness record)
    A train has run into Postojna Cave for more than 140 yearsTourist Board
    The olm in the caves can live up to 100 yearsTourist Board
    Slovenian has a dual form and more than 40 dialectsGovernment of Slovenia
    The commonest names are Franc and Marija; the surname, NovakGovernment of Slovenia
    Lipica stud farm was founded in 1580Tourist Board
    Dobrna spa has treated patients since 1403Tourist Board
    Mercury was discovered at Idrija in 1490UNESCO
    More than half the country is forestGovernment of Slovenia
    The largest population of wild bears living free, per the Tourist BoardTourist Board
    The national anthem is a toast by PrešerenGovernment of Slovenia

    Checked on 4 October 2026. Where the source is the Tourist Board, the record or superlative is theirs.

    Before you go

    What I would keep in mind

    1. 01 Most beautiful

      A vine over 400 years old

      In Maribor's Lent district grows a modra kavčina vine recognised by Guinness World Records as more than 400 years old, according to the Tourist Board.

      oldest vine in the world
    2. 02 My tip

      A castle inside a cave

      Predjama Castle, wedged into a 123-metre rock face for more than 800 years, is the largest cave castle in the world according to Guinness World Records.

      Predjama Castle
    3. 03 Worth the splurge

      The steepest zipline

      At Planica you can zip down the ski-flying hill on what the Tourist Board calls the steepest zipline in the world.

      Planica

    How to do it, in order

    1. See the oldest vine in Maribor

      Guinness World Records lists the vine on Lent, by the Drava, as the oldest in the world.

      Maribor

    2. Visit the largest cave castle

      Predjama sits wedged in a 123 m rock face, the largest cave castle in the world.

      Predjama

    3. Take the train into Postojna

      Visitors have entered Postojna Cave by train for more than 140 years.

      Since 1872

    Records with a Guinness stamp

    Two have an official stamp. In Maribor’s Lent district grows a modra kavčina vine that, according to the Tourist Board, Guinness World Records recognises as more than 400 years old, the oldest in the world. I stick with that cautious figure, the one on the vine’s own page. The other is Predjama Castle, wedged into a 123-metre rock face for more than 800 years and listed by Guinness as the largest cave castle in the world. The vine’s story, with its museum house, is in the oldest vine in the world.

    Facts from underground

    The Karst is good for a few surprises. You’ve been able to ride a train into Postojna Cave for more than 140 years, and according to the Tourist Board no other karst cave has a railway. It’s home to the olm, the largest cave-dwelling animal, which can live to 100 and go years without food; the first hatching ever observed was in May 2016. Predjama Castle, meanwhile, has tunnels leading down to the cave beneath it. Both visits are covered in Postojna Cave.

    Language, the dual and names

    Slovenian still uses the dual, a separate grammatical number for pairs, and has more than 40 dialects in a country of two million people, according to the government. The same source gives Franc and Marija as the commonest first names and Novak as the most common surname. And the national anthem isn’t a military march but a toast, the seventh stanza of France Prešeren’s «Zdravljica».

    Once your dates are set, check which hotels are still free in Maribor before prices climb.

    Old dates in unexpected places

    Three dates stand out for me. Lipica stud farm, the cradle of the Lipizzaner horse, was founded in 1580. Dobrna has treated patients since 1403, so the Tourist Board presents it as Slovenia’s longest-running spa still in business. And at Idrija mercury was discovered in 1490, according to UNESCO, which lists the town as World Heritage together with Almadén in Spain.

    Nature you might not expect

    The government puts forest at over half of the land, and the Tourist Board says Slovenia has the largest number of wild bears living in a natural environment. That’s no joke, because the FCDO warns that bears roam wooded areas across the country, including near towns. How to behave in the forest is explained in bears in Slovenia.

    If you would rather have a local show you round, book a guided tour in Maribor and choose by the reviews.

    And one for thrill-seekers

    At Planica, near Kranjska Gora, the valley of the ski-flying hills, you can ride a zipline down the jump itself. The Tourist Board describes it as the steepest zipline in the world. I haven’t seen that record confirmed elsewhere, so I’ve left it with its owner’s name attached.

    Once your dates are set, check which hotels are still free in Maribor before prices climb.

    Predjama Castle set into a cave mouth in a huge rock face, with green meadows below

    Predjama Castle set into a cave mouth in a huge rock face, with green meadows below

    White and dark Lipizzaner horses grazing in a tree-dotted pasture at the Lipica stud farm in the Karst

    White and dark Lipizzaner horses grazing in a tree-dotted pasture at the Lipica stud farm in the Karst

    The snow-covered ski jumping and ski flying hills of Planica at the head of the valley, among mountain forests

    The snow-covered ski jumping and ski flying hills of Planica at the head of the valley, among mountain forests

    Test yourself

    True or false?

    0/3 Pick before you peek.

    1. The world's oldest vine grows in Slovenia.

      See the answer

      True. It's in Maribor's Lent district, and Guinness recognises it as over 400 years old, according to the Tourist Board.

    2. The olm, the creature of Postojna Cave, lives only a few months.

      See the answer

      False. It can live up to 100 years, according to the Tourist Board, and go years without eating.

    3. Marija is the commonest female name in Slovenia.

      See the answer

      True. That's what the Slovenian government says, with Franc for men and Novak as the surname.

    Years of the world's oldest vine
    400+
    Years of the Postojna cave train
    140+
    Year Terme Dobrna started treating patients
    1403
    Founding of Lipica stud farm
    1580

    0 of 425 Slovenia guides

    Your next stamp

    1. Slovenia castles
    2. History
    3. Things to do

    Facts about Slovenia: questions and answers

    What is Slovenia most famous for?

    Lake Bled and its island, the only natural island in the country, and the Karst caves at Postojna and Škocjan. Among the curiosities, the world's oldest vine in Maribor.

    Are there really bears in Slovenia?

    Yes. The Tourist Board says Slovenia has the largest number of wild bears living in a natural environment, and the FCDO warns that bears live in wooded areas across the country, including near towns.

    What is special about the Slovenian language?

    It keeps the dual, a grammatical form for talking about two of something, and has more than 40 dialects for a country of two million people, according to the government.

    Where is the oldest vine in the world?

    In the Lent district of Maribor. The Tourist Board says Guinness World Records officially recognises it as more than 400 years old.

    What are common Slovenian names?

    According to the government, the most frequent first names are Franc and Marija, and the most common surname is Novak.

    Sergio Lepone

    Questions about Slovenia? Write to me

    If you need something else to finish planning, write to me. I answer myself, no templates.

    My email sergiolepone@gmail.com

    Sergio Lepone

    By

    Tourism graduate with a master’s in Tourism Management and Planning from the University of Málaga, who has travelled across Europe. He writes every guide from official sources and his own judgement.

    Published on . Updated on . Facts checked on .

    How I check every fact and where it comes from

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    Photos: Marco Almbauer (CC BY-SA 4.0); Marco Almbauer (CC0); KLMircea from Focsani, Romania (CC BY-SA 2.0); Miran Hojnik (CC BY 2.0), via Wikimedia Commons.