Prohodna is a natural phenomenon in Bulgaria, a karst cave, located near the village of Karlukovo in Lukovit Municipality. The cave is known for the two eye-like holes in its ceiling, known as the Eyes of God. They were formed due to erosion.

Prohodna is the longest cave passage in Bulgaria. It is popular among rock climbers.

It takes about an hour and a half to reach it from Sofia. The cave can be visited all year long. In winter and when it is raining the Eyes of God seem to be crying as water is dropping into the cave. 

private transport