In the Bihor region, specifically in the community of Rosia, lies a captivating natural wonder: Gruet Cave, also known as Gruiețului or Grust Cave. A river flows through the cave, a fascinating byproduct of the melting glacier above the Apuseni Mountains. The cave opens with an impressive 15-meter-wide and 8-meter-high portal leading to a 50-meter-long main gallery, a sanctuary of limestone formations. What makes it even more remarkable is the presence of deep fissures filled with water that can be deceptively transparent and deep, requiring extreme caution.

The environment inside is not as cold as one might expect due to rainwater mixing with the glacier runoff, making it more hospitable for its primary inhabitants: bats. These creatures can be found throughout the cave, not just near the entrance. Visitors should also take note of the water levels during rainy weather, as they can rise dramatically, a detail indicated by a black stripe on the cave wall.

After your journey, washing off your gear in running water and enjoying a good swig of whiskey are essential. The cave stands as a vivid reminder of the rich geological and biological diversity the region has to offer, adding an enthralling chapter to any adventure.