Postojna Cave, Postojna

Condé Nast TravelerOct 13, 2025

The Coolest Places Around the World From Where You Can Mail a Letter

Send snail mail from high up in the mountains or under the sea at these postal landmarks around the world.

Cave system with an underground post office.

7 things in this story

Postojna CaveSightCave system with an underground post office.
Elsewhere
Eiffel TowerSightParis, FranceTower with a first-level post office.
Port LockroySightGoudier Island, AntarcticaWorld's southernmost post office, museum, penguin colony.
Hideaway IslandSightMele, VanuatuIslet with the world's only underwater post office.
North Everest Base CampSightTingri, ChinaLocation of the world's highest temporary post office.
Dal LakeSightSrinagar, IndiaLake with a floating post office.
MolokaiNeighborhoodHoolehua, United StatesIsland with a post office that mails coconuts.

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National GeographicFeb 10, 2025

Why Slovenia is Europe’s best-kept secret for hikers

Europe has long been a popular vacation destination, be it for a steamy summer vacation or a Christmas market train journey. For hiking enthusiasts, Europe offers a seemingly endless bounty of ...

Cave system near Predjama Castle, accessible by train

19 things in this story

Postojna CaveSightCave system near Predjama Castle, accessible by train
Predjama CastleSightMedieval castle set into a cliff near Postojna Cave
Elsewhere
Camino de SantiagoTrailSantiago de Compostela, SpainLong-distance hiking pilgrimage route
Lake BledSightBled, SloveniaIconic Slovenian destination with short, easy hikes
MadeiraSightFunchal, PortugalIsland known for gentle levada walks
Triglav National ParkSightBled, SloveniaSlovenia's only national park, home to challenging routes
TriglavHotelBled, SloveniaSlovenia's highest peak, a technical hike
Triglavski Dom na KredariciHotelBled, SloveniaSlovenia's highest mountain lodge for overnight stays
Alpe-Adria TrailTrailVillach, Austria460-mile trail traversing Slovenia, Austria, and Italy
Soča ValleyNeighborhoodBovec, SloveniaFairytale-like forests in the Slovenian section of Alpe-Adria Trail
Skocjanske JameSightDivača, SloveniaUNESCO World Heritage cave system with underground paths
Reka RiverSightDivača, SloveniaRiver crossed by a bridge within Skocjan Caves
Trail of TrappistsTrailVipava Valley, SloveniaExplores old wine transport routes
Walk of PeaceTrailNova Gorica, Slovenia67-mile stretch with war remnants between Alps and Adriatic
Kobarid Historic TrailTrailKobarid, SloveniaTrail with forests, waterfalls, and WWI bunker remnants
Kobarid MuseumMuseumKobarid, SloveniaWWI-focused museum on the Kobarid Historic Trail
Velika PlaninaSightKamnik, SloveniaMountain plateau with herdsmen huts, accessible by cable car
Rupnik LineSightLjubljana, Slovenia
Soča FrontlineSightBovec, Slovenia

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Postojna Cave

In the coverage2 stories

The Coolest Places Around the World From Where You Can Mail a Letter

Why Slovenia is Europe’s best-kept secret for hikers