Devetashka is a massive cave located in rural Bulgaria and is believed to date back to the Stone Age. Unsurprisingly humans don’t tend to live in caves anymore and today the cave is home to over 30,000 bats. The cave is impressively large measuring a little over a mile (two kilometers) in length and in places over 100 meters in height. Several large holes in the roof, commonly referred to as eyes, allow daylight to illuminate the vast interior. This offers very interesting photographs, including at night when moonlight streams…
