Scarisoara Cave is one of the largest ice caves in Romania, formed 3,500 years ago during glacial periods when the Apuseni Mountains were covered in snow and ice. The 720 meter long cave contains over 100 ice stalagmites and has an estimated 75,000 cubic meters of ice, with depths of up to 20 meters thick in places. It was first explored and mapped in the 1860s and 1920s and remains one of Romania's natural wonders.