The huge elongated holes, which let light into the cave, look remarkably like a pair of human eyes. Prohodna is probably ... one of the largest karst regions in Bulgaria. At 365 metres long ...

Scientists found a “unique” animal with gold eyes in a cave and discovered a new species, a study said. Photo shows a representative karst forest in Satun province. Photo from Termprayoon ...

and Slaveya Kostadinova discovered a beautiful hall within the cave complex of the Iskar Gorge of Stara Planina near Lakatnik, Bulgaria. They investigated the often-overlooked entrance to the ...