The cave was first discovered over 100 years ago when a local resident reportedly sought to hide his livestock from a storm.
Biserujka is home to the endemic pseudoscorpion species Neobisium biserujkensis, which is found nowhere else in the world.
Excavations in the cave have uncovered fossilized bones of the extinct cave bear, Ursus spelaeus, dating back to the Pleistocene.
The name 'Biserujka' is derived from the word 'biser,' meaning pearl, based on a local legend of a hidden treasure belonging to smugglers.
The cave is part of a larger network of underground formations, though only the upper 110 meters are safely accessible to visitors.
The cave's constant microclimate makes it an ideal habitat for specific species of cave crickets and spiders.
Biserujka Cave is a karst cave located near the village of Rudine on the island of Krk, Croatia. It features a distinct subterranean landscape characterized by a large central hall filled with stalactites, stalagmites, and calcite pillars. The cave reaches a total length of approximately 110 meters, with a depth of about 12 meters below the surface. Its internal temperature remains constant at approximately 13 to 15 degrees Celsius throughout the year. The cave serves as an important site for biospeleology, housing rare endemic fauna such as the pseudoscorpion Neobisium biserujkensis. Visitors access the site via a well-maintained concrete path that traverses the main chambers. The cave is situated on a limestone plateau, and its entrance is located at an altitude of 176 meters above sea level. It has been a protected natural site and open to the public since the 20th century.
The Great Hall (Velika dvorana), where the density of stalactites and stalagmites provides the most dramatic composition.
Bring a light sweater or jacket as the cave remains chilly even during hot summer months.
Wear sturdy, non-slip footwear as the limestone walkways can be damp or slippery.
Visit during the shoulder seasons to avoid peak crowds and ensure a more intimate experience within the narrow passages.
Avoid visiting during mid-day in July and August when tour bus crowds make the narrow paths difficult to navigate.
Open seasonally from spring through autumn; remains closed during the winter months.
