Grotta Su Marmuri, Natural cave in Ulassai, Italy.
Grotta Su Marmuri is a natural cave in Ulassai featuring an extensive network of chambers and passages carved through limestone. The cave contains numerous rock formations including towering columns and floor-reaching formations created by water over countless years.
The cave's chambers and passages formed over millions of years as underground rivers dissolved the surrounding limestone. This geological process created the complex system that visitors can explore today without human intervention.
The name Su Marmuri comes from the Sardinian language, referring to how the polished limestone surfaces resemble marble. You can see and touch these smooth textures throughout the cave, where light bounces off the curved walls in interesting ways.
Reaching the cave entrance involves climbing stairs, so wear comfortable shoes and watch your footing on wet surfaces. Bring a jacket since the temperature underground is noticeably cooler than outside.
The cave is home to one of Europe's largest bat colonies that you may spot while exploring the passages. The main chamber also contains a particularly impressive stalagmite formation that towers high above the ground.
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