The people living in this part of northwestern Bulgaria are used to caves, grottoes and all kinds of rock formations.
It is easy to see why – the whole area literally sits on a soft limestone bedrock, and the elements have carved into it hundreds of bigger and smaller holes.
Logically, the Bulgarian national club of spelunkers have set up their centre here. But even the locals have been so impressed with this strange cave that they have named it "God's Eyes." A favourite shooting location for filmmakers, the God's Eyes cave is easy to miss unless you know exactly where to go: the local asphalt road... passes over it. Hint: One of Bulgaria's most infamous psychiatric clinics is in the village nearby.
Where in Bulgaria are you?