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The cave Biserujka is a small but very interesting cave on the outskirts of the village of Rudine on the island of Krk. A cave 110 m long and 12 m deep was carved in rocks by water of about 16 thousand. years ago. Biserujka attracts tourists with wonderfully preserved formations - hundreds of stalactites and stalagmites as well as fancifully shaped draperies and columns.
Local legend has it that there was a great pirate treasure in the cave. Apparently it was found and hidden again, but so far its location has not been determined. The natural treasure of the cave is six species of endemic creatures (invertebrates and lizards), which are not found anywhere except Biserjuka.
The cave has been open to visitors since 1998. Inside it has a constant temperature of about 15 degrees Celsius, so when planning a longer stay you should get warm clothes.