Biserujka cave

Biserujka is a karst cave near Rudine village on Krk island extending about 60 meters underground with several distinct chambers. The underground spaces contain stalactites and stalagmites that have formed over long periods and shape the cave's structure.

The cave was first mentioned in court records in 1834 and served as a hideout for smugglers before becoming a tourist site in the late 1990s.

The name Biserujka comes from the Croatian word for pearl, inspired by old local stories about hidden treasures within its passages.

The cave maintains a consistent temperature around 13 degrees Celsius throughout the year, so visitors should bring appropriate clothing. Guided tours are offered regularly and groups are kept to manageable sizes to ensure safe exploration of the underground passages.

The cave is home to rare endemic species found nowhere else, including specialized cave-dwelling organisms that have adapted to live only in this underground environment. These rare residents make the site valuable to scientists and show how specialized life underground can become.