Follow through shot of the tunnels going to the chambers of Prohodna Cave, passing by limestone walls and stalagmites where holes known as God's Eyes can be seen in Karlukovo, in Bulgaria

prohodna cave gods eyes karlukovo prohodna karst iskar gorge lukovit municipality lovech province geological park iskarpanega tourist attraction destination speleology cave entrance passage cave popular spots prehistoric waterways subterranean caverns chambers speleological site rock wall crevices gorges wall climbing bungee jumping tourists tourism natural rock formations nature outdoors landscape scenic view geological formations attractions gorge tunnels karts hiking trails cave galleries landmark spelunking stalactites stalagmites trekking sunlit