Biserujka
Encyclopedia
Biserujka is a cave
Cave
A cave or cavern is a natural underground space large enough for a human to enter. The term applies to natural cavities some part of which is in total darkness. The word cave also includes smaller spaces like rock shelters, sea caves, and grottos.Speleology is the science of exploration and study...

 located 6 km northeast of Dobrinj
Dobrinj
Dobrinj is a municipality in the Primorje-Gorski Kotar county in western Croatia, on the island of Krk. There are 1,970 inhabitants, with 91% Croats.The settlements in the municipality are:* Čižići* Dobrinj* Dolovo* Gabonjin* Gostinjac* Hlapa...

, in the village of Rudine, above Slivanjska Bay, in the island of Krk
Krk
Krk is a Croatian island in the northern Adriatic Sea, located near Rijeka in the Bay of Kvarner and part of the Primorje-Gorski Kotar county....

, Croatia
Croatia
Croatia , officially the Republic of Croatia , is a unitary democratic parliamentary republic in Europe at the crossroads of the Mitteleuropa, the Balkans, and the Mediterranean. Its capital and largest city is Zagreb. The country is divided into 20 counties and the city of Zagreb. Croatia covers ...

.

An undistinguished stone house in the middle of a bare karst
KARST
Kilometer-square Area Radio Synthesis Telescope is a Chinese telescope project to which FAST is a forerunner. KARST is a set of large spherical reflectors on karst landforms, which are bowlshaped limestone sinkholes named after the Kras region in Slovenia and Northern Italy. It will consist of...

 landscape hides the entrance to a cave 12 m under the surface. Although it is not very long if compared to other caves, only 110 m deep, the Biserujka cave has everything that is characteristic of karst phenomena. It has lots of typical features such as stalactites and stalagmites, and also a gallery
Mining
Mining is the extraction of valuable minerals or other geological materials from the earth, from an ore body, vein or seam. The term also includes the removal of soil. Materials recovered by mining include base metals, precious metals, iron, uranium, coal, diamonds, limestone, oil shale, rock...

 or hall
Hall
In architecture, a hall is fundamentally a relatively large space enclosed by a roof and walls. In the Iron Age, a mead hall was such a simple building and was the residence of a lord and his retainers...

, which is suitable for the holding of concerts. However, because of the low temperature, about 13 °C, people cannot stand being there for long periods of time, so that only short musical pieces can be performed. Since 1998, the cave has been arranged for sightseeing and the hosts can take groups of 25 at a time.
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