Mramornica Cave
A cave near Brtonigla with some of the largest stalagmites in Istria, entered through a collapse pit.
Updated 30 August 2026
Mramornica is entered through a collapsed doline, with a staircase running down into a single large chamber some sixty metres long, and its formations are the reason it is open: several columns and stalagmites here are among the tallest in Istria, one of them around ten metres. The cave was known and visited in the nineteenth century - names and dates scratched by early visitors are still on the walls - and was fitted with stairs and lighting for regular tours in the 2000s. Bones of cave bear and other Pleistocene animals have been found in the deposits. The temperature inside stays around fourteen degrees all year.
What's there
- Some of Istria's tallest formations - one column around ten metres.
- A single large chamber - about sixty metres long.
- Nineteenth century visitor graffiti - names and dates on the walls.
- Cave bear remains - found in the floor deposits.
When to go
April to October; tours run on a schedule. Two hours.
Before you go
Access is by guided tour only and times are limited outside summer. The staircase down and back is steep. It is cold and damp inside whatever the weather above. The visit is about forty minutes.
Nearby
Brtonigla's wine cellars are close; Novigrad is on the coast west.
What to pack for Mramornica Cave
Chosen from what this place is for. Tap a kit for the full checklist.
- Head torch + spare batteries - Hands-free light is essential; caves are truly dark. Find on Amazon
- Grippy closed shoes - Cave floors are wet, muddy and slick with formations. Find on Amazon
- A warm layer - Many caves sit near 10°C year-round, even in a hot country. Find on Amazon
- Gloves - Protect your hands on rough rock and cold metal handrails. Find on Amazon
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Opening times, ticket prices and seasonal closures change - check the official source before you go: official site.


